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iscsi-target: Fix rx_login_comp hang after login failure
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / iscsi / iscsi_target.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21#include <linux/string.h>
22#include <linux/kthread.h>
23#include <linux/crypto.h>
24#include <linux/completion.h>
827509e3 25#include <linux/module.h>
40401530 26#include <linux/idr.h>
e48354ce
NB		 27#include <asm/unaligned.h>
28#include <scsi/scsi_device.h>
29#include <scsi/iscsi_proto.h>
d28b1169 30#include <scsi/scsi_tcq.h>
e48354ce 31#include <target/target_core_base.h>
c4795fb2 32#include <target/target_core_fabric.h>
d28b1169 33#include <target/target_core_configfs.h>
e48354ce
NB		 34
35#include "iscsi_target_core.h"
36#include "iscsi_target_parameters.h"
37#include "iscsi_target_seq_pdu_list.h"
38#include "iscsi_target_tq.h"
39#include "iscsi_target_configfs.h"
40#include "iscsi_target_datain_values.h"
41#include "iscsi_target_erl0.h"
42#include "iscsi_target_erl1.h"
43#include "iscsi_target_erl2.h"
44#include "iscsi_target_login.h"
45#include "iscsi_target_tmr.h"
46#include "iscsi_target_tpg.h"
47#include "iscsi_target_util.h"
48#include "iscsi_target.h"
49#include "iscsi_target_device.h"
50#include "iscsi_target_stat.h"
51
baa4d64b
NB		 52#include <target/iscsi/iscsi_transport.h>
53
e48354ce
NB		 54static LIST_HEAD(g_tiqn_list);
55static LIST_HEAD(g_np_list);
56static DEFINE_SPINLOCK(tiqn_lock);
85c3c54b 57static DEFINE_MUTEX(np_lock);
e48354ce
NB		 58
59static struct idr tiqn_idr;
60struct idr sess_idr;
61struct mutex auth_id_lock;
62spinlock_t sess_idr_lock;
63
64struct iscsit_global *iscsit_global;
65
66struct kmem_cache *lio_cmd_cache;
67struct kmem_cache *lio_qr_cache;
68struct kmem_cache *lio_dr_cache;
69struct kmem_cache *lio_ooo_cache;
70struct kmem_cache *lio_r2t_cache;
71
72static int iscsit_handle_immediate_data(struct iscsi_cmd *,
2ec5a8c1 73 struct iscsi_scsi_req *, u32);
e48354ce
NB		 74
75struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
76{
77 struct iscsi_tiqn *tiqn = NULL;
78
79 spin_lock(&tiqn_lock);
80 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
81 if (!strcmp(tiqn->tiqn, buf)) {
82
83 spin_lock(&tiqn->tiqn_state_lock);
84 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
85 tiqn->tiqn_access_count++;
86 spin_unlock(&tiqn->tiqn_state_lock);
87 spin_unlock(&tiqn_lock);
88 return tiqn;
89 }
90 spin_unlock(&tiqn->tiqn_state_lock);
91 }
92 }
93 spin_unlock(&tiqn_lock);
94
95 return NULL;
96}
97
98static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
99{
100 spin_lock(&tiqn->tiqn_state_lock);
101 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
102 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
103 spin_unlock(&tiqn->tiqn_state_lock);
104 return 0;
105 }
106 spin_unlock(&tiqn->tiqn_state_lock);
107
108 return -1;
109}
110
111void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
112{
113 spin_lock(&tiqn->tiqn_state_lock);
114 tiqn->tiqn_access_count--;
115 spin_unlock(&tiqn->tiqn_state_lock);
116}
117
118/*
119 * Note that IQN formatting is expected to be done in userspace, and
120 * no explict IQN format checks are done here.
121 */
122struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
123{
124 struct iscsi_tiqn *tiqn = NULL;
125 int ret;
126
8f50c7f5 127 if (strlen(buf) >= ISCSI_IQN_LEN) {
e48354ce
NB		 128 pr_err("Target IQN exceeds %d bytes\n",
129 ISCSI_IQN_LEN);
130 return ERR_PTR(-EINVAL);
131 }
132
133 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
134 if (!tiqn) {
135 pr_err("Unable to allocate struct iscsi_tiqn\n");
136 return ERR_PTR(-ENOMEM);
137 }
138
139 sprintf(tiqn->tiqn, "%s", buf);
140 INIT_LIST_HEAD(&tiqn->tiqn_list);
141 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
142 spin_lock_init(&tiqn->tiqn_state_lock);
143 spin_lock_init(&tiqn->tiqn_tpg_lock);
144 spin_lock_init(&tiqn->sess_err_stats.lock);
145 spin_lock_init(&tiqn->login_stats.lock);
146 spin_lock_init(&tiqn->logout_stats.lock);
147
e48354ce
NB		 148 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
149
c9365bd0 150 idr_preload(GFP_KERNEL);
e48354ce 151 spin_lock(&tiqn_lock);
c9365bd0
TH		 152
153 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
e48354ce 154 if (ret < 0) {
c9365bd0 155 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
e48354ce 156 spin_unlock(&tiqn_lock);
c9365bd0 157 idr_preload_end();
e48354ce
NB		 158 kfree(tiqn);
159 return ERR_PTR(ret);
160 }
c9365bd0 161 tiqn->tiqn_index = ret;
e48354ce 162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
c9365bd0 163
e48354ce 164 spin_unlock(&tiqn_lock);
c9365bd0 165 idr_preload_end();
e48354ce
NB		 166
167 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
168
169 return tiqn;
170
171}
172
173static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
174{
175 /*
176 * Wait for accesses to said struct iscsi_tiqn to end.
177 */
178 spin_lock(&tiqn->tiqn_state_lock);
179 while (tiqn->tiqn_access_count != 0) {
180 spin_unlock(&tiqn->tiqn_state_lock);
181 msleep(10);
182 spin_lock(&tiqn->tiqn_state_lock);
183 }
184 spin_unlock(&tiqn->tiqn_state_lock);
185}
186
187void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
188{
189 /*
190 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
191 * while holding tiqn->tiqn_state_lock. This means that all subsequent
192 * attempts to access this struct iscsi_tiqn will fail from both transport
193 * fabric and control code paths.
194 */
195 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
196 pr_err("iscsit_set_tiqn_shutdown() failed\n");
197 return;
198 }
199
200 iscsit_wait_for_tiqn(tiqn);
201
202 spin_lock(&tiqn_lock);
203 list_del(&tiqn->tiqn_list);
204 idr_remove(&tiqn_idr, tiqn->tiqn_index);
205 spin_unlock(&tiqn_lock);
206
207 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 tiqn->tiqn);
209 kfree(tiqn);
210}
211
212int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
213{
214 int ret;
215 /*
216 * Determine if the network portal is accepting storage traffic.
217 */
218 spin_lock_bh(&np->np_thread_lock);
219 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
220 spin_unlock_bh(&np->np_thread_lock);
221 return -1;
222 }
223 if (np->np_login_tpg) {
224 pr_err("np->np_login_tpg() is not NULL!\n");
225 spin_unlock_bh(&np->np_thread_lock);
226 return -1;
227 }
228 spin_unlock_bh(&np->np_thread_lock);
229 /*
230 * Determine if the portal group is accepting storage traffic.
231 */
232 spin_lock_bh(&tpg->tpg_state_lock);
233 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
234 spin_unlock_bh(&tpg->tpg_state_lock);
235 return -1;
236 }
237 spin_unlock_bh(&tpg->tpg_state_lock);
238
239 /*
240 * Here we serialize access across the TIQN+TPG Tuple.
241 */
242 ret = mutex_lock_interruptible(&tpg->np_login_lock);
243 if ((ret != 0) || signal_pending(current))
244 return -1;
245
246 spin_lock_bh(&np->np_thread_lock);
247 np->np_login_tpg = tpg;
248 spin_unlock_bh(&np->np_thread_lock);
249
250 return 0;
251}
252
253int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
254{
255 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
256
257 spin_lock_bh(&np->np_thread_lock);
258 np->np_login_tpg = NULL;
259 spin_unlock_bh(&np->np_thread_lock);
260
261 mutex_unlock(&tpg->np_login_lock);
262
263 if (tiqn)
264 iscsit_put_tiqn_for_login(tiqn);
265
266 return 0;
267}
268
05b96892 269bool iscsit_check_np_match(
e48354ce 270 struct __kernel_sockaddr_storage *sockaddr,
05b96892 271 struct iscsi_np *np,
e48354ce
NB		 272 int network_transport)
273{
274 struct sockaddr_in *sock_in, *sock_in_e;
275 struct sockaddr_in6 *sock_in6, *sock_in6_e;
05b96892 276 bool ip_match = false;
e48354ce
NB		 277 u16 port;
278
05b96892
NB		 279 if (sockaddr->ss_family == AF_INET6) {
280 sock_in6 = (struct sockaddr_in6 *)sockaddr;
281 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
282
283 if (!memcmp(&sock_in6->sin6_addr.in6_u,
284 &sock_in6_e->sin6_addr.in6_u,
285 sizeof(struct in6_addr)))
286 ip_match = true;
287
288 port = ntohs(sock_in6->sin6_port);
289 } else {
290 sock_in = (struct sockaddr_in *)sockaddr;
291 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
292
293 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
294 ip_match = true;
295
296 port = ntohs(sock_in->sin_port);
297 }
298
299 if ((ip_match == true) && (np->np_port == port) &&
300 (np->np_network_transport == network_transport))
301 return true;
302
303 return false;
304}
305
85c3c54b
AG		 306/*
307 * Called with mutex np_lock held
308 */
05b96892
NB		 309static struct iscsi_np *iscsit_get_np(
310 struct __kernel_sockaddr_storage *sockaddr,
311 int network_transport)
312{
313 struct iscsi_np *np;
314 bool match;
315
e48354ce 316 list_for_each_entry(np, &g_np_list, np_list) {
85c3c54b 317 spin_lock_bh(&np->np_thread_lock);
e48354ce 318 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
85c3c54b 319 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 320 continue;
321 }
322
05b96892
NB		 323 match = iscsit_check_np_match(sockaddr, np, network_transport);
324 if (match == true) {
e48354ce
NB		 325 /*
326 * Increment the np_exports reference count now to
327 * prevent iscsit_del_np() below from being called
328 * while iscsi_tpg_add_network_portal() is called.
329 */
330 np->np_exports++;
85c3c54b 331 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 332 return np;
333 }
85c3c54b 334 spin_unlock_bh(&np->np_thread_lock);
e48354ce 335 }
e48354ce
NB		 336
337 return NULL;
338}
339
340struct iscsi_np *iscsit_add_np(
341 struct __kernel_sockaddr_storage *sockaddr,
342 char *ip_str,
343 int network_transport)
344{
345 struct sockaddr_in *sock_in;
346 struct sockaddr_in6 *sock_in6;
347 struct iscsi_np *np;
348 int ret;
85c3c54b
AG		 349
350 mutex_lock(&np_lock);
351
e48354ce
NB		 352 /*
353 * Locate the existing struct iscsi_np if already active..
354 */
355 np = iscsit_get_np(sockaddr, network_transport);
85c3c54b
AG		 356 if (np) {
357 mutex_unlock(&np_lock);
e48354ce 358 return np;
85c3c54b 359 }
e48354ce
NB		 360
361 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
362 if (!np) {
363 pr_err("Unable to allocate memory for struct iscsi_np\n");
85c3c54b 364 mutex_unlock(&np_lock);
e48354ce
NB		 365 return ERR_PTR(-ENOMEM);
366 }
367
368 np->np_flags |= NPF_IP_NETWORK;
369 if (sockaddr->ss_family == AF_INET6) {
370 sock_in6 = (struct sockaddr_in6 *)sockaddr;
371 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
372 np->np_port = ntohs(sock_in6->sin6_port);
373 } else {
374 sock_in = (struct sockaddr_in *)sockaddr;
375 sprintf(np->np_ip, "%s", ip_str);
376 np->np_port = ntohs(sock_in->sin_port);
377 }
378
379 np->np_network_transport = network_transport;
380 spin_lock_init(&np->np_thread_lock);
381 init_completion(&np->np_restart_comp);
382 INIT_LIST_HEAD(&np->np_list);
383
384 ret = iscsi_target_setup_login_socket(np, sockaddr);
385 if (ret != 0) {
386 kfree(np);
85c3c54b 387 mutex_unlock(&np_lock);
e48354ce
NB		 388 return ERR_PTR(ret);
389 }
390
391 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
392 if (IS_ERR(np->np_thread)) {
393 pr_err("Unable to create kthread: iscsi_np\n");
394 ret = PTR_ERR(np->np_thread);
395 kfree(np);
85c3c54b 396 mutex_unlock(&np_lock);
e48354ce
NB		 397 return ERR_PTR(ret);
398 }
399 /*
400 * Increment the np_exports reference count now to prevent
401 * iscsit_del_np() below from being run while a new call to
402 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
403 * active. We don't need to hold np->np_thread_lock at this
404 * point because iscsi_np has not been added to g_np_list yet.
405 */
406 np->np_exports = 1;
85c3c54b 407 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
e48354ce 408
e48354ce 409 list_add_tail(&np->np_list, &g_np_list);
85c3c54b 410 mutex_unlock(&np_lock);
e48354ce
NB		 411
412 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
baa4d64b 413 np->np_ip, np->np_port, np->np_transport->name);
e48354ce
NB		 414
415 return np;
416}
417
418int iscsit_reset_np_thread(
419 struct iscsi_np *np,
420 struct iscsi_tpg_np *tpg_np,
421 struct iscsi_portal_group *tpg)
422{
423 spin_lock_bh(&np->np_thread_lock);
424 if (tpg && tpg_np) {
425 /*
426 * The reset operation need only be performed when the
427 * passed struct iscsi_portal_group has a login in progress
428 * to one of the network portals.
429 */
430 if (tpg_np->tpg_np->np_login_tpg != tpg) {
431 spin_unlock_bh(&np->np_thread_lock);
432 return 0;
433 }
434 }
435 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
436 spin_unlock_bh(&np->np_thread_lock);
437 return 0;
438 }
439 np->np_thread_state = ISCSI_NP_THREAD_RESET;
440
441 if (np->np_thread) {
442 spin_unlock_bh(&np->np_thread_lock);
443 send_sig(SIGINT, np->np_thread, 1);
444 wait_for_completion(&np->np_restart_comp);
445 spin_lock_bh(&np->np_thread_lock);
446 }
447 spin_unlock_bh(&np->np_thread_lock);
448
449 return 0;
450}
451
baa4d64b 452static void iscsit_free_np(struct iscsi_np *np)
e48354ce 453{
bf6932f4
AV		 454 if (np->np_socket)
455 sock_release(np->np_socket);
e48354ce
NB		 456}
457
458int iscsit_del_np(struct iscsi_np *np)
459{
460 spin_lock_bh(&np->np_thread_lock);
461 np->np_exports--;
462 if (np->np_exports) {
96f27d26 463 np->enabled = true;
e48354ce
NB		 464 spin_unlock_bh(&np->np_thread_lock);
465 return 0;
466 }
467 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
468 spin_unlock_bh(&np->np_thread_lock);
469
470 if (np->np_thread) {
471 /*
472 * We need to send the signal to wakeup Linux/Net
473 * which may be sleeping in sock_accept()..
474 */
475 send_sig(SIGINT, np->np_thread, 1);
476 kthread_stop(np->np_thread);
477 }
baa4d64b
NB		 478
479 np->np_transport->iscsit_free_np(np);
e48354ce 480
85c3c54b 481 mutex_lock(&np_lock);
e48354ce 482 list_del(&np->np_list);
85c3c54b 483 mutex_unlock(&np_lock);
e48354ce
NB		 484
485 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
baa4d64b 486 np->np_ip, np->np_port, np->np_transport->name);
e48354ce 487
baa4d64b 488 iscsit_put_transport(np->np_transport);
e48354ce
NB		 489 kfree(np);
490 return 0;
491}
492
2ec5a8c1
NB		 493static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495
496static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
497{
498 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
499 return 0;
500}
501
baa4d64b
NB		 502static struct iscsit_transport iscsi_target_transport = {
503 .name = "iSCSI/TCP",
504 .transport_type = ISCSI_TCP,
505 .owner = NULL,
506 .iscsit_setup_np = iscsit_setup_np,
507 .iscsit_accept_np = iscsit_accept_np,
508 .iscsit_free_np = iscsit_free_np,
cdb72665 509 .iscsit_alloc_cmd = iscsit_alloc_cmd,
baa4d64b
NB		 510 .iscsit_get_login_rx = iscsit_get_login_rx,
511 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 512 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 513 .iscsit_immediate_queue = iscsit_immediate_queue,
514 .iscsit_response_queue = iscsit_response_queue,
515 .iscsit_queue_data_in = iscsit_queue_rsp,
516 .iscsit_queue_status = iscsit_queue_rsp,
baa4d64b
NB		 517};
518
e48354ce
NB		 519static int __init iscsi_target_init_module(void)
520{
49b028d3 521 int ret = 0, size;
e48354ce
NB		 522
523 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
524
525 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
526 if (!iscsit_global) {
527 pr_err("Unable to allocate memory for iscsit_global\n");
528 return -1;
529 }
49b028d3 530 spin_lock_init(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 531 mutex_init(&auth_id_lock);
532 spin_lock_init(&sess_idr_lock);
533 idr_init(&tiqn_idr);
534 idr_init(&sess_idr);
535
536 ret = iscsi_target_register_configfs();
537 if (ret < 0)
538 goto out;
539
49b028d3
NB		 540 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
541 iscsit_global->ts_bitmap = vzalloc(size);
542 if (!iscsit_global->ts_bitmap) {
543 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
e48354ce 544 goto configfs_out;
e48354ce
NB		 545 }
546
547 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
548 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
549 0, NULL);
550 if (!lio_cmd_cache) {
551 pr_err("Unable to kmem_cache_create() for"
552 " lio_cmd_cache\n");
49b028d3 553 goto bitmap_out;
e48354ce
NB		 554 }
555
556 lio_qr_cache = kmem_cache_create("lio_qr_cache",
557 sizeof(struct iscsi_queue_req),
558 __alignof__(struct iscsi_queue_req), 0, NULL);
559 if (!lio_qr_cache) {
560 pr_err("nable to kmem_cache_create() for"
561 " lio_qr_cache\n");
562 goto cmd_out;
563 }
564
565 lio_dr_cache = kmem_cache_create("lio_dr_cache",
566 sizeof(struct iscsi_datain_req),
567 __alignof__(struct iscsi_datain_req), 0, NULL);
568 if (!lio_dr_cache) {
569 pr_err("Unable to kmem_cache_create() for"
570 " lio_dr_cache\n");
571 goto qr_out;
572 }
573
574 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
575 sizeof(struct iscsi_ooo_cmdsn),
576 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
577 if (!lio_ooo_cache) {
578 pr_err("Unable to kmem_cache_create() for"
579 " lio_ooo_cache\n");
580 goto dr_out;
581 }
582
583 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
584 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
585 0, NULL);
586 if (!lio_r2t_cache) {
587 pr_err("Unable to kmem_cache_create() for"
588 " lio_r2t_cache\n");
589 goto ooo_out;
590 }
591
baa4d64b
NB		 592 iscsit_register_transport(&iscsi_target_transport);
593
e48354ce
NB		 594 if (iscsit_load_discovery_tpg() < 0)
595 goto r2t_out;
596
597 return ret;
598r2t_out:
599 kmem_cache_destroy(lio_r2t_cache);
600ooo_out:
601 kmem_cache_destroy(lio_ooo_cache);
602dr_out:
603 kmem_cache_destroy(lio_dr_cache);
604qr_out:
605 kmem_cache_destroy(lio_qr_cache);
606cmd_out:
607 kmem_cache_destroy(lio_cmd_cache);
49b028d3
NB		 608bitmap_out:
609 vfree(iscsit_global->ts_bitmap);
e48354ce
NB		 610configfs_out:
611 iscsi_target_deregister_configfs();
612out:
613 kfree(iscsit_global);
614 return -ENOMEM;
615}
616
617static void __exit iscsi_target_cleanup_module(void)
618{
e48354ce 619 iscsit_release_discovery_tpg();
baa4d64b 620 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 621 kmem_cache_destroy(lio_cmd_cache);
622 kmem_cache_destroy(lio_qr_cache);
623 kmem_cache_destroy(lio_dr_cache);
624 kmem_cache_destroy(lio_ooo_cache);
625 kmem_cache_destroy(lio_r2t_cache);
626
627 iscsi_target_deregister_configfs();
628
49b028d3 629 vfree(iscsit_global->ts_bitmap);
e48354ce
NB		 630 kfree(iscsit_global);
631}
632
8b1e1244 633static int iscsit_add_reject(
1aa58ccd 634 struct iscsi_conn *conn,
e48354ce 635 u8 reason,
1aa58ccd 636 unsigned char *buf)
e48354ce
NB		 637{
638 struct iscsi_cmd *cmd;
e48354ce
NB		 639
640 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
641 if (!cmd)
642 return -1;
643
644 cmd->iscsi_opcode = ISCSI_OP_REJECT;
1aa58ccd 645 cmd->reject_reason = reason;
e48354ce 646
1c3d5794 647 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 648 if (!cmd->buf_ptr) {
649 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 650 iscsit_free_cmd(cmd, false);
e48354ce
NB		 651 return -1;
652 }
e48354ce
NB		 653
654 spin_lock_bh(&conn->cmd_lock);
2fbb471e 655 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 656 spin_unlock_bh(&conn->cmd_lock);
657
658 cmd->i_state = ISTATE_SEND_REJECT;
659 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
660
1aa58ccd 661 return -1;
e48354ce
NB		 662}
663
1aa58ccd
NB		 664static int iscsit_add_reject_from_cmd(
665 struct iscsi_cmd *cmd,
e48354ce 666 u8 reason,
1aa58ccd
NB		 667 bool add_to_conn,
668 unsigned char *buf)
e48354ce
NB		 669{
670 struct iscsi_conn *conn;
e48354ce
NB		 671
672 if (!cmd->conn) {
673 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
674 cmd->init_task_tag);
675 return -1;
676 }
677 conn = cmd->conn;
678
679 cmd->iscsi_opcode = ISCSI_OP_REJECT;
1aa58ccd 680 cmd->reject_reason = reason;
e48354ce 681
1c3d5794 682 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 683 if (!cmd->buf_ptr) {
684 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 685 iscsit_free_cmd(cmd, false);
e48354ce
NB		 686 return -1;
687 }
e48354ce
NB		 688
689 if (add_to_conn) {
690 spin_lock_bh(&conn->cmd_lock);
2fbb471e 691 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 692 spin_unlock_bh(&conn->cmd_lock);
693 }
694
695 cmd->i_state = ISTATE_SEND_REJECT;
696 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 697 /*
698 * Perform the kref_put now if se_cmd has already been setup by
699 * scsit_setup_scsi_cmd()
700 */
701 if (cmd->se_cmd.se_tfo != NULL) {
702 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
703 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
704 }
1aa58ccd
NB		 705 return -1;
706}
707
708static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
709 unsigned char *buf)
710{
711 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
712}
e48354ce 713
1aa58ccd
NB		 714int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
715{
716 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce
NB		 717}
718
719/*
720 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 721 * kernel sockets to copy data in/out.
e48354ce
NB		 722 */
723static int iscsit_map_iovec(
724 struct iscsi_cmd *cmd,
725 struct kvec *iov,
726 u32 data_offset,
727 u32 data_length)
728{
729 u32 i = 0;
730 struct scatterlist *sg;
731 unsigned int page_off;
732
733 /*
bfb79eac 734 * We know each entry in t_data_sg contains a page.
e48354ce 735 */
bfb79eac 736 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 737 page_off = (data_offset % PAGE_SIZE);
738
739 cmd->first_data_sg = sg;
740 cmd->first_data_sg_off = page_off;
741
742 while (data_length) {
743 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
744
745 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
746 iov[i].iov_len = cur_len;
747
748 data_length -= cur_len;
749 page_off = 0;
750 sg = sg_next(sg);
751 i++;
752 }
753
754 cmd->kmapped_nents = i;
755
756 return i;
757}
758
759static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
760{
761 u32 i;
762 struct scatterlist *sg;
763
764 sg = cmd->first_data_sg;
765
766 for (i = 0; i < cmd->kmapped_nents; i++)
767 kunmap(sg_page(&sg[i]));
768}
769
770static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
771{
772 struct iscsi_cmd *cmd;
773
774 conn->exp_statsn = exp_statsn;
775
3e1c81a9
NB		 776 if (conn->sess->sess_ops->RDMAExtensions)
777 return;
778
e48354ce 779 spin_lock_bh(&conn->cmd_lock);
2fbb471e 780 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 781 spin_lock(&cmd->istate_lock);
782 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 783 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 784 cmd->i_state = ISTATE_REMOVE;
785 spin_unlock(&cmd->istate_lock);
786 iscsit_add_cmd_to_immediate_queue(cmd, conn,
787 cmd->i_state);
788 continue;
789 }
790 spin_unlock(&cmd->istate_lock);
791 }
792 spin_unlock_bh(&conn->cmd_lock);
793}
794
795static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
796{
f80e8ed3 797 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 798
c0427f15 799 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 800
801 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
802 if (!cmd->iov_data) {
803 pr_err("Unable to allocate cmd->iov_data\n");
804 return -ENOMEM;
805 }
806
807 cmd->orig_iov_data_count = iov_count;
808 return 0;
809}
810
3e1c81a9
NB		 811int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
812 unsigned char *buf)
e48354ce 813{
3e1c81a9 814 int data_direction, payload_length;
e48354ce 815 struct iscsi_scsi_req *hdr;
d28b1169
AG		 816 int iscsi_task_attr;
817 int sam_task_attr;
e48354ce
NB		 818
819 spin_lock_bh(&conn->sess->session_stats_lock);
820 conn->sess->cmd_pdus++;
821 if (conn->sess->se_sess->se_node_acl) {
822 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
823 conn->sess->se_sess->se_node_acl->num_cmds++;
824 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
825 }
826 spin_unlock_bh(&conn->sess->session_stats_lock);
827
828 hdr = (struct iscsi_scsi_req *) buf;
829 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 830
831 /* FIXME; Add checks for AdditionalHeaderSegment */
832
833 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
834 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
835 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
836 " not set. Bad iSCSI Initiator.\n");
1aa58ccd
NB		 837 return iscsit_add_reject_cmd(cmd,
838 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 839 }
840
841 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
842 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
843 /*
42ea20ee
NB		 844 * From RFC-3720 Section 10.3.1:
845 *
846 * "Either or both of R and W MAY be 1 when either the
847 * Expected Data Transfer Length and/or Bidirectional Read
848 * Expected Data Transfer Length are 0"
849 *
850 * For this case, go ahead and clear the unnecssary bits
851 * to avoid any confusion with ->data_direction.
e48354ce 852 */
42ea20ee
NB		 853 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
854 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 855
42ea20ee 856 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 857 " set when Expected Data Transfer Length is 0 for"
42ea20ee 858 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 859 }
e48354ce
NB		 860
861 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
862 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
863 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
864 " MUST be set if Expected Data Transfer Length is not 0."
865 " Bad iSCSI Initiator\n");
1aa58ccd
NB		 866 return iscsit_add_reject_cmd(cmd,
867 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 868 }
869
870 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
871 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
872 pr_err("Bidirectional operations not supported!\n");
1aa58ccd
NB		 873 return iscsit_add_reject_cmd(cmd,
874 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 875 }
876
877 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
878 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
879 " Scsi Command PDU.\n");
1aa58ccd
NB		 880 return iscsit_add_reject_cmd(cmd,
881 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 882 }
883
884 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
885 pr_err("ImmediateData=No but DataSegmentLength=%u,"
886 " protocol error.\n", payload_length);
1aa58ccd
NB		 887 return iscsit_add_reject_cmd(cmd,
888 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 889 }
890
1aa58ccd 891 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 892 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
893 pr_err("Expected Data Transfer Length and Length of"
894 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
895 " bit is not set protocol error\n");
1aa58ccd
NB		 896 return iscsit_add_reject_cmd(cmd,
897 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 898 }
899
50e5c87d 900 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 901 pr_err("DataSegmentLength: %u is greater than"
902 " EDTL: %u, protocol error.\n", payload_length,
903 hdr->data_length);
1aa58ccd
NB		 904 return iscsit_add_reject_cmd(cmd,
905 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 906 }
907
21f5aa7e 908 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 909 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 910 " MaxXmitDataSegmentLength: %u, protocol error.\n",
911 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd
NB		 912 return iscsit_add_reject_cmd(cmd,
913 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 914 }
915
916 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
917 pr_err("DataSegmentLength: %u is greater than"
918 " FirstBurstLength: %u, protocol error.\n",
919 payload_length, conn->sess->sess_ops->FirstBurstLength);
1aa58ccd
NB		 920 return iscsit_add_reject_cmd(cmd,
921 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 922 }
923
924 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
925 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
926 DMA_NONE;
927
d28b1169 928 cmd->data_direction = data_direction;
d28b1169
AG		 929 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
930 /*
931 * Figure out the SAM Task Attribute for the incoming SCSI CDB
932 */
933 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
934 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
935 sam_task_attr = MSG_SIMPLE_TAG;
936 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
937 sam_task_attr = MSG_ORDERED_TAG;
938 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
939 sam_task_attr = MSG_HEAD_TAG;
940 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
941 sam_task_attr = MSG_ACA_TAG;
942 else {
943 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
944 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
945 sam_task_attr = MSG_SIMPLE_TAG;
946 }
947
e48354ce
NB		 948 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
949 cmd->i_state = ISTATE_NEW_CMD;
950 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
951 cmd->immediate_data = (payload_length) ? 1 : 0;
952 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
953 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
954 if (cmd->unsolicited_data)
955 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
956
957 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
958 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
959 spin_lock_bh(&conn->sess->ttt_lock);
960 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
961 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
962 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
963 spin_unlock_bh(&conn->sess->ttt_lock);
964 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
965 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 966 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
967 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 968 cmd->first_burst_len = payload_length;
969
3e1c81a9
NB		 970 if (!conn->sess->sess_ops->RDMAExtensions &&
971 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 972 struct iscsi_datain_req *dr;
973
974 dr = iscsit_allocate_datain_req();
975 if (!dr)
1aa58ccd
NB		 976 return iscsit_add_reject_cmd(cmd,
977 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 978
979 iscsit_attach_datain_req(cmd, dr);
980 }
981
065ca1e4
AG		 982 /*
983 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
984 */
985 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 986 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
987 cmd->data_direction, sam_task_attr,
988 cmd->sense_buffer + 2);
065ca1e4
AG		 989
990 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
991 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 992 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
993 conn->cid);
994
995 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 996
de103c93
CH		 997 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
998 scsilun_to_int(&hdr->lun));
999 if (cmd->sense_reason)
1000 goto attach_cmd;
1001
1002 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1003 if (cmd->sense_reason) {
1004 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1aa58ccd
NB		 1005 return iscsit_add_reject_cmd(cmd,
1006 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1007 }
de103c93 1008
e48354ce
NB		 1009 goto attach_cmd;
1010 }
a12f41f8 1011
de103c93 1012 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1aa58ccd
NB		 1013 return iscsit_add_reject_cmd(cmd,
1014 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1015 }
1016
1017attach_cmd:
1018 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1019 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1020 spin_unlock_bh(&conn->cmd_lock);
1021 /*
1022 * Check if we need to delay processing because of ALUA
1023 * Active/NonOptimized primary access state..
1024 */
1025 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1026
3e1c81a9
NB		 1027 return 0;
1028}
1029EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1030
3e1c81a9
NB		 1031void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1032{
1033 iscsit_set_dataout_sequence_values(cmd);
1034
1035 spin_lock_bh(&cmd->dataout_timeout_lock);
1036 iscsit_start_dataout_timer(cmd, cmd->conn);
1037 spin_unlock_bh(&cmd->dataout_timeout_lock);
1038}
1039EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1040
1041int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1042 struct iscsi_scsi_req *hdr)
1043{
1044 int cmdsn_ret = 0;
e48354ce
NB		 1045 /*
1046 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1047 * the Immediate Bit is not set, and no Immediate
1048 * Data is attached.
1049 *
1050 * A PDU/CmdSN carrying Immediate Data can only
1051 * be processed after the DataCRC has passed.
1052 * If the DataCRC fails, the CmdSN MUST NOT
1053 * be acknowledged. (See below)
1054 */
1055 if (!cmd->immediate_data) {
adb97c29
NB		 1056 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1057 (unsigned char *)hdr, hdr->cmdsn);
1058 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1059 return -1;
1060 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1061 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1062 return 0;
3e1c81a9 1063 }
e48354ce
NB		 1064 }
1065
50e5c87d 1066 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1067
1068 /*
1069 * If no Immediate Data is attached, it's OK to return now.
1070 */
1071 if (!cmd->immediate_data) {
3e1c81a9
NB		 1072 if (!cmd->sense_reason && cmd->unsolicited_data)
1073 iscsit_set_unsoliticed_dataout(cmd);
1074 if (!cmd->sense_reason)
1075 return 0;
e48354ce 1076
3e1c81a9 1077 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1078 return 0;
1079 }
1080
1081 /*
3e1c81a9
NB		 1082 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1083 * execution. These exceptions are processed in CmdSN order using
1084 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1085 */
de103c93 1086 if (cmd->sense_reason) {
adb97c29
NB		 1087 if (cmd->reject_reason)
1088 return 0;
1089
3e1c81a9 1090 return 1;
e48354ce
NB		 1091 }
1092 /*
1093 * Call directly into transport_generic_new_cmd() to perform
1094 * the backend memory allocation.
1095 */
de103c93 1096 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
adb97c29 1097 if (cmd->sense_reason)
3e1c81a9 1098 return 1;
e48354ce 1099
3e1c81a9
NB		 1100 return 0;
1101}
1102EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1103
1104static int
1105iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1106 bool dump_payload)
1107{
adb97c29 1108 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1109 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1110 /*
1111 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1112 */
1113 if (dump_payload == true)
1114 goto after_immediate_data;
1115
1116 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1117 cmd->first_burst_len);
e48354ce
NB		 1118after_immediate_data:
1119 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1120 /*
1121 * A PDU/CmdSN carrying Immediate Data passed
1122 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1123 * Immediate Bit is not set.
1124 */
adb97c29
NB		 1125 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1126 (unsigned char *)hdr, hdr->cmdsn);
ce799c71 1127 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
adb97c29 1128 return -1;
3e1c81a9 1129
ce799c71 1130 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
adb97c29
NB		 1131 int rc;
1132
1133 rc = iscsit_dump_data_payload(cmd->conn,
1134 cmd->first_burst_len, 1);
1135 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1136 return rc;
3e1c81a9
NB		 1137 } else if (cmd->unsolicited_data)
1138 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1139
e48354ce
NB		 1140 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1141 /*
1142 * Immediate Data failed DataCRC and ERL>=1,
1143 * silently drop this PDU and let the initiator
1144 * plug the CmdSN gap.
1145 *
1146 * FIXME: Send Unsolicited NOPIN with reserved
1147 * TTT here to help the initiator figure out
1148 * the missing CmdSN, although they should be
1149 * intelligent enough to determine the missing
1150 * CmdSN and issue a retry to plug the sequence.
1151 */
1152 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1153 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1154 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1155 return -1;
1156
1157 return 0;
1158}
1159
3e1c81a9
NB		 1160static int
1161iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1162 unsigned char *buf)
1163{
1164 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1165 int rc, immed_data;
1166 bool dump_payload = false;
1167
1168 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1169 if (rc < 0)
adb97c29 1170 return 0;
3e1c81a9
NB		 1171 /*
1172 * Allocation iovecs needed for struct socket operations for
1173 * traditional iSCSI block I/O.
1174 */
1175 if (iscsit_allocate_iovecs(cmd) < 0) {
81b444c7 1176 return iscsit_reject_cmd(cmd,
1aa58ccd 1177 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1178 }
1179 immed_data = cmd->immediate_data;
1180
1181 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1182 if (rc < 0)
1183 return rc;
1184 else if (rc > 0)
1185 dump_payload = true;
1186
1187 if (!immed_data)
1188 return 0;
1189
1190 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1191}
1192
e48354ce
NB		 1193static u32 iscsit_do_crypto_hash_sg(
1194 struct hash_desc *hash,
1195 struct iscsi_cmd *cmd,
1196 u32 data_offset,
1197 u32 data_length,
1198 u32 padding,
1199 u8 *pad_bytes)
1200{
1201 u32 data_crc;
1202 u32 i;
1203 struct scatterlist *sg;
1204 unsigned int page_off;
1205
1206 crypto_hash_init(hash);
1207
1208 sg = cmd->first_data_sg;
1209 page_off = cmd->first_data_sg_off;
1210
1211 i = 0;
1212 while (data_length) {
1213 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1214
1215 crypto_hash_update(hash, &sg[i], cur_len);
1216
1217 data_length -= cur_len;
1218 page_off = 0;
1219 i++;
1220 }
1221
1222 if (padding) {
1223 struct scatterlist pad_sg;
1224
1225 sg_init_one(&pad_sg, pad_bytes, padding);
1226 crypto_hash_update(hash, &pad_sg, padding);
1227 }
1228 crypto_hash_final(hash, (u8 *) &data_crc);
1229
1230 return data_crc;
1231}
1232
1233static void iscsit_do_crypto_hash_buf(
1234 struct hash_desc *hash,
80690fdb 1235 const void *buf,
e48354ce
NB		 1236 u32 payload_length,
1237 u32 padding,
1238 u8 *pad_bytes,
1239 u8 *data_crc)
1240{
1241 struct scatterlist sg;
1242
1243 crypto_hash_init(hash);
1244
8359cf43 1245 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1246 crypto_hash_update(hash, &sg, payload_length);
1247
1248 if (padding) {
1249 sg_init_one(&sg, pad_bytes, padding);
1250 crypto_hash_update(hash, &sg, padding);
1251 }
1252 crypto_hash_final(hash, data_crc);
1253}
1254
3e1c81a9
NB		 1255int
1256iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1257 struct iscsi_cmd **out_cmd)
e48354ce 1258{
3e1c81a9 1259 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1260 struct iscsi_cmd *cmd = NULL;
1261 struct se_cmd *se_cmd;
e48354ce 1262 unsigned long flags;
3e1c81a9
NB		 1263 u32 payload_length = ntoh24(hdr->dlength);
1264 int rc;
e48354ce
NB		 1265
1266 if (!payload_length) {
1267 pr_err("DataOUT payload is ZERO, protocol error.\n");
1aa58ccd
NB		 1268 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1269 buf);
e48354ce
NB		 1270 }
1271
1272 /* iSCSI write */
1273 spin_lock_bh(&conn->sess->session_stats_lock);
1274 conn->sess->rx_data_octets += payload_length;
1275 if (conn->sess->se_sess->se_node_acl) {
1276 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1277 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1278 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1279 }
1280 spin_unlock_bh(&conn->sess->session_stats_lock);
1281
21f5aa7e 1282 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1283 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1284 " MaxXmitDataSegmentLength: %u\n", payload_length,
1285 conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd
NB		 1286 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1287 buf);
e48354ce
NB		 1288 }
1289
1290 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1291 payload_length);
1292 if (!cmd)
1293 return 0;
1294
1295 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1296 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1297 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1298 payload_length, conn->cid);
1299
1300 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1301 pr_err("Command ITT: 0x%08x received DataOUT after"
1302 " last DataOUT received, dumping payload\n",
1303 cmd->init_task_tag);
1304 return iscsit_dump_data_payload(conn, payload_length, 1);
1305 }
1306
1307 if (cmd->data_direction != DMA_TO_DEVICE) {
1308 pr_err("Command ITT: 0x%08x received DataOUT for a"
1309 " NON-WRITE command.\n", cmd->init_task_tag);
2152a122 1310 return iscsit_dump_data_payload(conn, payload_length, 1);
e48354ce
NB		 1311 }
1312 se_cmd = &cmd->se_cmd;
1313 iscsit_mod_dataout_timer(cmd);
1314
50e5c87d 1315 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1316 pr_err("DataOut Offset: %u, Length %u greater than"
1317 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1318 hdr->offset, payload_length, cmd->se_cmd.data_length);
1aa58ccd 1319 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1320 }
1321
1322 if (cmd->unsolicited_data) {
1323 int dump_unsolicited_data = 0;
1324
1325 if (conn->sess->sess_ops->InitialR2T) {
1326 pr_err("Received unexpected unsolicited data"
1327 " while InitialR2T=Yes, protocol error.\n");
1328 transport_send_check_condition_and_sense(&cmd->se_cmd,
1329 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1330 return -1;
1331 }
1332 /*
1333 * Special case for dealing with Unsolicited DataOUT
1334 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1335 * failures;
1336 */
1337
1338 /* Something's amiss if we're not in WRITE_PENDING state... */
1339 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1340 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1341 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1342
1343 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
de103c93 1344 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce
NB		 1345 dump_unsolicited_data = 1;
1346 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1347
1348 if (dump_unsolicited_data) {
1349 /*
1350 * Check if a delayed TASK_ABORTED status needs to
1351 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1352 * received with the unsolicitied data out.
1353 */
1354 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1355 iscsit_stop_dataout_timer(cmd);
1356
1357 transport_check_aborted_status(se_cmd,
1358 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1359 return iscsit_dump_data_payload(conn, payload_length, 1);
1360 }
1361 } else {
1362 /*
1363 * For the normal solicited data path:
1364 *
1365 * Check for a delayed TASK_ABORTED status and dump any
1366 * incoming data out payload if one exists. Also, when the
1367 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1368 * data out sequence, we decrement outstanding_r2ts. Once
1369 * outstanding_r2ts reaches zero, go ahead and send the delayed
1370 * TASK_ABORTED status.
1371 */
7d680f3b 1372 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1373 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1374 if (--cmd->outstanding_r2ts < 1) {
1375 iscsit_stop_dataout_timer(cmd);
1376 transport_check_aborted_status(
1377 se_cmd, 1);
1378 }
1379
1380 return iscsit_dump_data_payload(conn, payload_length, 1);
1381 }
1382 }
1383 /*
1384 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1385 * within-command recovery checks before receiving the payload.
1386 */
3e1c81a9
NB		 1387 rc = iscsit_check_pre_dataout(cmd, buf);
1388 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1389 return 0;
3e1c81a9 1390 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1391 return -1;
1392
3e1c81a9
NB		 1393 *out_cmd = cmd;
1394 return 0;
1395}
1396EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1397
1398static int
1399iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1400 struct iscsi_data *hdr)
1401{
1402 struct kvec *iov;
1403 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1404 u32 payload_length = ntoh24(hdr->dlength);
1405 int iov_ret, data_crc_failed = 0;
1406
e48354ce
NB		 1407 rx_size += payload_length;
1408 iov = &cmd->iov_data[0];
1409
50e5c87d
CH		 1410 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1411 payload_length);
e48354ce
NB		 1412 if (iov_ret < 0)
1413 return -1;
1414
1415 iov_count += iov_ret;
1416
1417 padding = ((-payload_length) & 3);
1418 if (padding != 0) {
1419 iov[iov_count].iov_base = cmd->pad_bytes;
1420 iov[iov_count++].iov_len = padding;
1421 rx_size += padding;
1422 pr_debug("Receiving %u padding bytes.\n", padding);
1423 }
1424
1425 if (conn->conn_ops->DataDigest) {
1426 iov[iov_count].iov_base = &checksum;
1427 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1428 rx_size += ISCSI_CRC_LEN;
1429 }
1430
1431 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1432
1433 iscsit_unmap_iovec(cmd);
1434
1435 if (rx_got != rx_size)
1436 return -1;
1437
1438 if (conn->conn_ops->DataDigest) {
1439 u32 data_crc;
1440
1441 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1442 be32_to_cpu(hdr->offset),
1443 payload_length, padding,
e48354ce
NB		 1444 cmd->pad_bytes);
1445
1446 if (checksum != data_crc) {
1447 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1448 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1449 " does not match computed 0x%08x\n",
1450 hdr->itt, hdr->offset, payload_length,
1451 hdr->datasn, checksum, data_crc);
1452 data_crc_failed = 1;
1453 } else {
1454 pr_debug("Got CRC32C DataDigest 0x%08x for"
1455 " %u bytes of Data Out\n", checksum,
1456 payload_length);
1457 }
1458 }
3e1c81a9
NB		 1459
1460 return data_crc_failed;
1461}
1462
1463int
1464iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1465 bool data_crc_failed)
1466{
1467 struct iscsi_conn *conn = cmd->conn;
1468 int rc, ooo_cmdsn;
e48354ce
NB		 1469 /*
1470 * Increment post receive data and CRC values or perform
1471 * within-command recovery.
1472 */
3e1c81a9
NB		 1473 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1474 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1475 return 0;
3e1c81a9 1476 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1477 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1478 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1479 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1480 /*
1481 * Handle extra special case for out of order
1482 * Unsolicited Data Out.
1483 */
1484 spin_lock_bh(&cmd->istate_lock);
1485 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1486 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1487 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1488 spin_unlock_bh(&cmd->istate_lock);
1489
1490 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1491 if (ooo_cmdsn)
1492 return 0;
1493 target_execute_cmd(&cmd->se_cmd);
1494 return 0;
e48354ce
NB		 1495 } else /* DATAOUT_CANNOT_RECOVER */
1496 return -1;
1497
1498 return 0;
1499}
3e1c81a9 1500EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1501
3e1c81a9
NB		 1502static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1503{
1504 struct iscsi_cmd *cmd;
1505 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1506 int rc;
1507 bool data_crc_failed = false;
1508
1509 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1510 if (rc < 0)
adb97c29 1511 return 0;
3e1c81a9
NB		 1512 else if (!cmd)
1513 return 0;
1514
1515 rc = iscsit_get_dataout(conn, cmd, hdr);
1516 if (rc < 0)
1517 return rc;
1518 else if (rc > 0)
1519 data_crc_failed = true;
1520
1521 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1522}
1523
1524int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1525 unsigned char *buf)
e48354ce
NB		 1526{
1527 unsigned char *ping_data = NULL;
1528 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1529 u32 checksum, data_crc, padding = 0, payload_length;
3e1c81a9 1530 struct iscsi_cmd *cmd_p = NULL;
e48354ce
NB		 1531 struct kvec *iov = NULL;
1532 struct iscsi_nopout *hdr;
1533
1534 hdr = (struct iscsi_nopout *) buf;
1535 payload_length = ntoh24(hdr->dlength);
e48354ce 1536
66c7db68 1537 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1538 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1539 " not set, protocol error.\n");
382e9ff1
NB		 1540 if (!cmd)
1541 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1542 (unsigned char *)hdr);
1543
1aa58ccd
NB		 1544 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1545 (unsigned char *)hdr);
e48354ce
NB		 1546 }
1547
21f5aa7e 1548 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1549 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1550 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1551 " error.\n", payload_length,
21f5aa7e 1552 conn->conn_ops->MaxXmitDataSegmentLength);
382e9ff1
NB		 1553 if (!cmd)
1554 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1555 (unsigned char *)hdr);
1556
1aa58ccd
NB		 1557 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1558 (unsigned char *)hdr);
e48354ce
NB		 1559 }
1560
3e1c81a9 1561 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1562 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1563 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1564 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1565 payload_length);
1566 /*
1567 * This is not a response to a Unsolicited NopIN, which means
1568 * it can either be a NOPOUT ping request (with a valid ITT),
1569 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1570 * Either way, make sure we allocate an struct iscsi_cmd, as both
1571 * can contain ping data.
1572 */
50e5c87d 1573 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce 1574 if (!cmd)
1aa58ccd 1575 return iscsit_reject_cmd(cmd,
e48354ce 1576 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1aa58ccd 1577 (unsigned char *)hdr);
e48354ce
NB		 1578
1579 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1580 cmd->i_state = ISTATE_SEND_NOPIN;
1581 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1582 1 : 0);
1583 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1584 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1585 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1586 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1587 cmd->data_direction = DMA_NONE;
1588 }
1589
50e5c87d 1590 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1591 rx_size = payload_length;
1592 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1593 if (!ping_data) {
1594 pr_err("Unable to allocate memory for"
1595 " NOPOUT ping data.\n");
1596 ret = -1;
1597 goto out;
1598 }
1599
1600 iov = &cmd->iov_misc[0];
1601 iov[niov].iov_base = ping_data;
1602 iov[niov++].iov_len = payload_length;
1603
1604 padding = ((-payload_length) & 3);
1605 if (padding != 0) {
1606 pr_debug("Receiving %u additional bytes"
1607 " for padding.\n", padding);
1608 iov[niov].iov_base = &cmd->pad_bytes;
1609 iov[niov++].iov_len = padding;
1610 rx_size += padding;
1611 }
1612 if (conn->conn_ops->DataDigest) {
1613 iov[niov].iov_base = &checksum;
1614 iov[niov++].iov_len = ISCSI_CRC_LEN;
1615 rx_size += ISCSI_CRC_LEN;
1616 }
1617
1618 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1619 if (rx_got != rx_size) {
1620 ret = -1;
1621 goto out;
1622 }
1623
1624 if (conn->conn_ops->DataDigest) {
1625 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1626 ping_data, payload_length,
1627 padding, cmd->pad_bytes,
1628 (u8 *)&data_crc);
1629
1630 if (checksum != data_crc) {
1631 pr_err("Ping data CRC32C DataDigest"
1632 " 0x%08x does not match computed 0x%08x\n",
1633 checksum, data_crc);
1634 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1635 pr_err("Unable to recover from"
1636 " NOPOUT Ping DataCRC failure while in"
1637 " ERL=0.\n");
1638 ret = -1;
1639 goto out;
1640 } else {
1641 /*
1642 * Silently drop this PDU and let the
1643 * initiator plug the CmdSN gap.
1644 */
1645 pr_debug("Dropping NOPOUT"
1646 " Command CmdSN: 0x%08x due to"
1647 " DataCRC error.\n", hdr->cmdsn);
1648 ret = 0;
1649 goto out;
1650 }
1651 } else {
1652 pr_debug("Got CRC32C DataDigest"
1653 " 0x%08x for %u bytes of ping data.\n",
1654 checksum, payload_length);
1655 }
1656 }
1657
1658 ping_data[payload_length] = '\0';
1659 /*
1660 * Attach ping data to struct iscsi_cmd->buf_ptr.
1661 */
8359cf43 1662 cmd->buf_ptr = ping_data;
e48354ce
NB		 1663 cmd->buf_ptr_size = payload_length;
1664
1665 pr_debug("Got %u bytes of NOPOUT ping"
1666 " data.\n", payload_length);
1667 pr_debug("Ping Data: \"%s\"\n", ping_data);
1668 }
1669
66c7db68 1670 if (hdr->itt != RESERVED_ITT) {
e48354ce
NB		 1671 if (!cmd) {
1672 pr_err("Checking CmdSN for NOPOUT,"
1673 " but cmd is NULL!\n");
1674 return -1;
1675 }
1676 /*
1677 * Initiator is expecting a NopIN ping reply,
1678 */
1679 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1680 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1681 spin_unlock_bh(&conn->cmd_lock);
1682
50e5c87d 1683 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1684
1685 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1686 iscsit_add_cmd_to_response_queue(cmd, conn,
1687 cmd->i_state);
1688 return 0;
1689 }
1690
adb97c29
NB		 1691 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1692 (unsigned char *)hdr, hdr->cmdsn);
e48354ce
NB		 1693 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1694 ret = 0;
1695 goto ping_out;
1696 }
1697 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 1698 return -1;
e48354ce
NB		 1699
1700 return 0;
1701 }
1702
50e5c87d 1703 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1704 /*
1705 * This was a response to a unsolicited NOPIN ping.
1706 */
3e1c81a9
NB		 1707 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1708 if (!cmd_p)
e48354ce
NB		 1709 return -1;
1710
1711 iscsit_stop_nopin_response_timer(conn);
1712
3e1c81a9
NB		 1713 cmd_p->i_state = ISTATE_REMOVE;
1714 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
e48354ce
NB		 1715 iscsit_start_nopin_timer(conn);
1716 } else {
1717 /*
1718 * Initiator is not expecting a NOPIN is response.
1719 * Just ignore for now.
1720 *
1721 * iSCSI v19-91 10.18
1722 * "A NOP-OUT may also be used to confirm a changed
1723 * ExpStatSN if another PDU will not be available
1724 * for a long time."
1725 */
1726 ret = 0;
1727 goto out;
1728 }
1729
1730 return 0;
1731out:
1732 if (cmd)
aafc9d15 1733 iscsit_free_cmd(cmd, false);
e48354ce
NB		 1734ping_out:
1735 kfree(ping_data);
1736 return ret;
1737}
3e1c81a9 1738EXPORT_SYMBOL(iscsit_handle_nop_out);
e48354ce 1739
3e1c81a9
NB		 1740int
1741iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1742 unsigned char *buf)
e48354ce 1743{
e48354ce
NB		 1744 struct se_tmr_req *se_tmr;
1745 struct iscsi_tmr_req *tmr_req;
1746 struct iscsi_tm *hdr;
c6ccbb9b
NB		 1747 int out_of_order_cmdsn = 0, ret;
1748 bool sess_ref = false;
e48354ce
NB		 1749 u8 function;
1750
1751 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1752 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1753 function = hdr->flags;
1754
1755 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1756 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1757 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1758 hdr->rtt, hdr->refcmdsn, conn->cid);
1759
1760 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1761 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1762 hdr->rtt != RESERVED_ITT)) {
e48354ce 1763 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1764 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1765 }
1766
1767 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1768 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1769 pr_err("Task Management Request TASK_REASSIGN not"
1770 " issued as immediate command, bad iSCSI Initiator"
1771 "implementation\n");
1aa58ccd
NB		 1772 return iscsit_add_reject_cmd(cmd,
1773 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1774 }
1775 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1776 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1777 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1778
d28b1169
AG		 1779 cmd->data_direction = DMA_NONE;
1780
1781 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1782 if (!cmd->tmr_req) {
1783 pr_err("Unable to allocate memory for"
1784 " Task Management command!\n");
1aa58ccd
NB		 1785 return iscsit_add_reject_cmd(cmd,
1786 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1787 buf);
d28b1169
AG		 1788 }
1789
1790 /*
1791 * TASK_REASSIGN for ERL=2 / connection stays inside of
1792 * LIO-Target $FABRIC_MOD
1793 */
1794 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1795
1796 u8 tcm_function;
1797 int ret;
1798
1799 transport_init_se_cmd(&cmd->se_cmd,
1800 &lio_target_fabric_configfs->tf_ops,
1801 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1802 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1803
c6ccbb9b
NB		 1804 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1805 sess_ref = true;
1806
d28b1169
AG		 1807 switch (function) {
1808 case ISCSI_TM_FUNC_ABORT_TASK:
1809 tcm_function = TMR_ABORT_TASK;
1810 break;
1811 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1812 tcm_function = TMR_ABORT_TASK_SET;
1813 break;
1814 case ISCSI_TM_FUNC_CLEAR_ACA:
1815 tcm_function = TMR_CLEAR_ACA;
1816 break;
1817 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1818 tcm_function = TMR_CLEAR_TASK_SET;
1819 break;
1820 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1821 tcm_function = TMR_LUN_RESET;
1822 break;
1823 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1824 tcm_function = TMR_TARGET_WARM_RESET;
1825 break;
1826 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1827 tcm_function = TMR_TARGET_COLD_RESET;
1828 break;
1829 default:
1830 pr_err("Unknown iSCSI TMR Function:"
1831 " 0x%02x\n", function);
1aa58ccd
NB		 1832 return iscsit_add_reject_cmd(cmd,
1833 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1834 }
1835
1836 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1837 tcm_function, GFP_KERNEL);
1838 if (ret < 0)
1aa58ccd
NB		 1839 return iscsit_add_reject_cmd(cmd,
1840 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1841
1842 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1843 }
e48354ce
NB		 1844
1845 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1846 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1847 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1848 cmd->init_task_tag = hdr->itt;
1849 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1850 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1851 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1852 se_tmr = cmd->se_cmd.se_tmr_req;
1853 tmr_req = cmd->tmr_req;
1854 /*
1855 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1856 */
1857 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1858 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1859 scsilun_to_int(&hdr->lun));
e48354ce 1860 if (ret < 0) {
e48354ce
NB		 1861 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1862 goto attach;
1863 }
1864 }
1865
1866 switch (function) {
1867 case ISCSI_TM_FUNC_ABORT_TASK:
1868 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1869 if (se_tmr->response)
e48354ce 1870 goto attach;
e48354ce
NB		 1871 break;
1872 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1873 case ISCSI_TM_FUNC_CLEAR_ACA:
1874 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1875 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1876 break;
1877 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1878 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1879 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1880 goto attach;
1881 }
1882 break;
1883 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1884 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1885 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1886 goto attach;
1887 }
1888 break;
1889 case ISCSI_TM_FUNC_TASK_REASSIGN:
1890 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1891 /*
1892 * Perform sanity checks on the ExpDataSN only if the
1893 * TASK_REASSIGN was successful.
1894 */
de103c93 1895 if (se_tmr->response)
e48354ce
NB		 1896 break;
1897
1898 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1aa58ccd
NB		 1899 return iscsit_add_reject_cmd(cmd,
1900 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1901 break;
1902 default:
1903 pr_err("Unknown TMR function: 0x%02x, protocol"
1904 " error.\n", function);
e48354ce
NB		 1905 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1906 goto attach;
1907 }
1908
1909 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1910 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1911 se_tmr->call_transport = 1;
1912attach:
1913 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1914 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1915 spin_unlock_bh(&conn->cmd_lock);
1916
1917 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
adb97c29 1918 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1919 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1920 out_of_order_cmdsn = 1;
5a4c8666 1921 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1922 return 0;
5a4c8666 1923 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 1924 return -1;
e48354ce 1925 }
50e5c87d 1926 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1927
5a4c8666 1928 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1929 return 0;
1930 /*
1931 * Found the referenced task, send to transport for processing.
1932 */
1933 if (se_tmr->call_transport)
1934 return transport_generic_handle_tmr(&cmd->se_cmd);
1935
1936 /*
1937 * Could not find the referenced LUN, task, or Task Management
1938 * command not authorized or supported. Change state and
1939 * let the tx_thread send the response.
1940 *
1941 * For connection recovery, this is also the default action for
1942 * TMR TASK_REASSIGN.
1943 */
c6ccbb9b
NB		 1944 if (sess_ref) {
1945 pr_debug("Handle TMR, using sess_ref=true check\n");
1946 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1947 }
1948
e48354ce
NB		 1949 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1950 return 0;
1951}
3e1c81a9 1952EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1953
1954/* #warning FIXME: Support Text Command parameters besides SendTargets */
1955static int iscsit_handle_text_cmd(
1956 struct iscsi_conn *conn,
1957 unsigned char *buf)
1958{
1959 char *text_ptr, *text_in;
1960 int cmdsn_ret, niov = 0, rx_got, rx_size;
1961 u32 checksum = 0, data_crc = 0, payload_length;
76f1928e 1962 u32 padding = 0, pad_bytes = 0, text_length = 0;
e48354ce
NB		 1963 struct iscsi_cmd *cmd;
1964 struct kvec iov[3];
1965 struct iscsi_text *hdr;
1966
1967 hdr = (struct iscsi_text *) buf;
1968 payload_length = ntoh24(hdr->dlength);
e48354ce 1969
21f5aa7e 1970 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1971 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1972 "greater than MaxXmitDataSegmentLength %u.\n",
1973 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd 1974 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1975 }
1976
1977 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1978 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1979 hdr->exp_statsn, payload_length);
1980
1981 rx_size = text_length = payload_length;
1982 if (text_length) {
1983 text_in = kzalloc(text_length, GFP_KERNEL);
1984 if (!text_in) {
1985 pr_err("Unable to allocate memory for"
1986 " incoming text parameters\n");
1987 return -1;
1988 }
1989
1990 memset(iov, 0, 3 * sizeof(struct kvec));
1991 iov[niov].iov_base = text_in;
1992 iov[niov++].iov_len = text_length;
1993
1994 padding = ((-payload_length) & 3);
1995 if (padding != 0) {
76f1928e 1996 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 1997 iov[niov++].iov_len = padding;
1998 rx_size += padding;
1999 pr_debug("Receiving %u additional bytes"
2000 " for padding.\n", padding);
2001 }
2002 if (conn->conn_ops->DataDigest) {
2003 iov[niov].iov_base = &checksum;
2004 iov[niov++].iov_len = ISCSI_CRC_LEN;
2005 rx_size += ISCSI_CRC_LEN;
2006 }
2007
2008 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2009 if (rx_got != rx_size) {
2010 kfree(text_in);
2011 return -1;
2012 }
2013
2014 if (conn->conn_ops->DataDigest) {
2015 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2016 text_in, text_length,
76f1928e 2017 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2018 (u8 *)&data_crc);
2019
2020 if (checksum != data_crc) {
2021 pr_err("Text data CRC32C DataDigest"
2022 " 0x%08x does not match computed"
2023 " 0x%08x\n", checksum, data_crc);
2024 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2025 pr_err("Unable to recover from"
2026 " Text Data digest failure while in"
2027 " ERL=0.\n");
2028 kfree(text_in);
2029 return -1;
2030 } else {
2031 /*
2032 * Silently drop this PDU and let the
2033 * initiator plug the CmdSN gap.
2034 */
2035 pr_debug("Dropping Text"
2036 " Command CmdSN: 0x%08x due to"
2037 " DataCRC error.\n", hdr->cmdsn);
2038 kfree(text_in);
2039 return 0;
2040 }
2041 } else {
2042 pr_debug("Got CRC32C DataDigest"
2043 " 0x%08x for %u bytes of text data.\n",
2044 checksum, text_length);
2045 }
2046 }
2047 text_in[text_length - 1] = '\0';
2048 pr_debug("Successfully read %d bytes of text"
2049 " data.\n", text_length);
2050
2051 if (strncmp("SendTargets", text_in, 11) != 0) {
2052 pr_err("Received Text Data that is not"
2053 " SendTargets, cannot continue.\n");
2054 kfree(text_in);
2055 return -1;
2056 }
2057 text_ptr = strchr(text_in, '=');
2058 if (!text_ptr) {
2059 pr_err("No \"=\" separator found in Text Data,"
2060 " cannot continue.\n");
2061 kfree(text_in);
2062 return -1;
2063 }
2064 if (strncmp("=All", text_ptr, 4) != 0) {
2065 pr_err("Unable to locate All value for"
2066 " SendTargets key, cannot continue.\n");
2067 kfree(text_in);
2068 return -1;
2069 }
2070/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2071 kfree(text_in);
2072 }
2073
2074 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2075 if (!cmd)
1aa58ccd
NB		 2076 return iscsit_add_reject(conn,
2077 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 2078
2079 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2080 cmd->i_state = ISTATE_SEND_TEXTRSP;
2081 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2082 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2083 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2084 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2085 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 2086 cmd->data_direction = DMA_NONE;
2087
2088 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2089 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2090 spin_unlock_bh(&conn->cmd_lock);
2091
50e5c87d 2092 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2093
2094 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
adb97c29
NB		 2095 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2096 (unsigned char *)hdr, hdr->cmdsn);
e48354ce 2097 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 2098 return -1;
e48354ce
NB		 2099
2100 return 0;
2101 }
2102
2103 return iscsit_execute_cmd(cmd, 0);
2104}
2105
2106int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2107{
2108 struct iscsi_conn *conn_p;
2109 struct iscsi_session *sess = conn->sess;
2110
2111 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2112 " for SID: %u.\n", conn->cid, conn->sess->sid);
2113
2114 atomic_set(&sess->session_logout, 1);
2115 atomic_set(&conn->conn_logout_remove, 1);
2116 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2117
2118 iscsit_inc_conn_usage_count(conn);
2119 iscsit_inc_session_usage_count(sess);
2120
2121 spin_lock_bh(&sess->conn_lock);
2122 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2123 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2124 continue;
2125
2126 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2127 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2128 }
2129 spin_unlock_bh(&sess->conn_lock);
2130
2131 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2132
2133 return 0;
2134}
2135
2136int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2137{
2138 struct iscsi_conn *l_conn;
2139 struct iscsi_session *sess = conn->sess;
2140
2141 pr_debug("Received logout request CLOSECONNECTION for CID:"
2142 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2143
2144 /*
2145 * A Logout Request with a CLOSECONNECTION reason code for a CID
2146 * can arrive on a connection with a differing CID.
2147 */
2148 if (conn->cid == cmd->logout_cid) {
2149 spin_lock_bh(&conn->state_lock);
2150 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2151 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2152
2153 atomic_set(&conn->conn_logout_remove, 1);
2154 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2155 iscsit_inc_conn_usage_count(conn);
2156
2157 spin_unlock_bh(&conn->state_lock);
2158 } else {
2159 /*
2160 * Handle all different cid CLOSECONNECTION requests in
2161 * iscsit_logout_post_handler_diffcid() as to give enough
2162 * time for any non immediate command's CmdSN to be
2163 * acknowledged on the connection in question.
2164 *
2165 * Here we simply make sure the CID is still around.
2166 */
2167 l_conn = iscsit_get_conn_from_cid(sess,
2168 cmd->logout_cid);
2169 if (!l_conn) {
2170 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2171 iscsit_add_cmd_to_response_queue(cmd, conn,
2172 cmd->i_state);
2173 return 0;
2174 }
2175
2176 iscsit_dec_conn_usage_count(l_conn);
2177 }
2178
2179 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2180
2181 return 0;
2182}
2183
2184int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2185{
2186 struct iscsi_session *sess = conn->sess;
2187
2188 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2189 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2190
2191 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2192 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2193 " while ERL!=2.\n");
2194 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2195 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2196 return 0;
2197 }
2198
2199 if (conn->cid == cmd->logout_cid) {
2200 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2201 " with CID: %hu on CID: %hu, implementation error.\n",
2202 cmd->logout_cid, conn->cid);
2203 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2204 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2205 return 0;
2206 }
2207
2208 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2209
2210 return 0;
2211}
2212
3e1c81a9
NB		 2213int
2214iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2215 unsigned char *buf)
e48354ce
NB		 2216{
2217 int cmdsn_ret, logout_remove = 0;
2218 u8 reason_code = 0;
e48354ce
NB		 2219 struct iscsi_logout *hdr;
2220 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2221
2222 hdr = (struct iscsi_logout *) buf;
2223 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2224
2225 if (tiqn) {
2226 spin_lock(&tiqn->logout_stats.lock);
2227 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2228 tiqn->logout_stats.normal_logouts++;
2229 else
2230 tiqn->logout_stats.abnormal_logouts++;
2231 spin_unlock(&tiqn->logout_stats.lock);
2232 }
2233
2234 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2235 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2236 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2237 hdr->cid, conn->cid);
2238
2239 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2240 pr_err("Received logout request on connection that"
2241 " is not in logged in state, ignoring request.\n");
aafc9d15 2242 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2243 return 0;
2244 }
2245
e48354ce
NB		 2246 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2247 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2248 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2249 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2250 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2251 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2252 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2253 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2254 cmd->logout_reason = reason_code;
2255 cmd->data_direction = DMA_NONE;
2256
2257 /*
2258 * We need to sleep in these cases (by returning 1) until the Logout
2259 * Response gets sent in the tx thread.
2260 */
2261 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2262 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2263 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2264 logout_remove = 1;
2265
2266 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2267 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2268 spin_unlock_bh(&conn->cmd_lock);
2269
2270 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2271 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2272
2273 /*
2274 * Immediate commands are executed, well, immediately.
2275 * Non-Immediate Logout Commands are executed in CmdSN order.
2276 */
c6037cc5 2277 if (cmd->immediate_cmd) {
e48354ce
NB		 2278 int ret = iscsit_execute_cmd(cmd, 0);
2279
2280 if (ret < 0)
2281 return ret;
2282 } else {
adb97c29 2283 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1aa58ccd 2284 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2285 logout_remove = 0;
1aa58ccd
NB		 2286 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2287 return -1;
e48354ce
NB		 2288 }
2289
2290 return logout_remove;
2291}
3e1c81a9 2292EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2293
2294static int iscsit_handle_snack(
2295 struct iscsi_conn *conn,
2296 unsigned char *buf)
2297{
e48354ce
NB		 2298 struct iscsi_snack *hdr;
2299
2300 hdr = (struct iscsi_snack *) buf;
2301 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2302
2303 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2304 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2305 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2306 hdr->begrun, hdr->runlength, conn->cid);
2307
2308 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2309 pr_err("Initiator sent SNACK request while in"
2310 " ErrorRecoveryLevel=0.\n");
1aa58ccd
NB		 2311 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2312 buf);
e48354ce
NB		 2313 }
2314 /*
2315 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2316 * call from inside iscsi_send_recovery_datain_or_r2t().
2317 */
2318 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2319 case 0:
2320 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2321 hdr->itt,
2322 be32_to_cpu(hdr->ttt),
2323 be32_to_cpu(hdr->begrun),
2324 be32_to_cpu(hdr->runlength));
e48354ce 2325 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2326 return iscsit_handle_status_snack(conn, hdr->itt,
2327 be32_to_cpu(hdr->ttt),
2328 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2329 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2330 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2331 be32_to_cpu(hdr->begrun),
2332 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2333 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2334 /* FIXME: Support R-Data SNACK */
2335 pr_err("R-Data SNACK Not Supported.\n");
1aa58ccd
NB		 2336 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2337 buf);
e48354ce
NB		 2338 default:
2339 pr_err("Unknown SNACK type 0x%02x, protocol"
2340 " error.\n", hdr->flags & 0x0f);
1aa58ccd
NB		 2341 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2342 buf);
e48354ce
NB		 2343 }
2344
2345 return 0;
2346}
2347
2348static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2349{
2350 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2351 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2352 wait_for_completion_interruptible_timeout(
2353 &conn->rx_half_close_comp,
2354 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2355 }
2356}
2357
2358static int iscsit_handle_immediate_data(
2359 struct iscsi_cmd *cmd,
3e1c81a9 2360 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2361 u32 length)
2362{
2363 int iov_ret, rx_got = 0, rx_size = 0;
2364 u32 checksum, iov_count = 0, padding = 0;
2365 struct iscsi_conn *conn = cmd->conn;
2366 struct kvec *iov;
2367
2368 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2369 if (iov_ret < 0)
2370 return IMMEDIATE_DATA_CANNOT_RECOVER;
2371
2372 rx_size = length;
2373 iov_count = iov_ret;
2374 iov = &cmd->iov_data[0];
2375
2376 padding = ((-length) & 3);
2377 if (padding != 0) {
2378 iov[iov_count].iov_base = cmd->pad_bytes;
2379 iov[iov_count++].iov_len = padding;
2380 rx_size += padding;
2381 }
2382
2383 if (conn->conn_ops->DataDigest) {
2384 iov[iov_count].iov_base = &checksum;
2385 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2386 rx_size += ISCSI_CRC_LEN;
2387 }
2388
2389 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2390
2391 iscsit_unmap_iovec(cmd);
2392
2393 if (rx_got != rx_size) {
2394 iscsit_rx_thread_wait_for_tcp(conn);
2395 return IMMEDIATE_DATA_CANNOT_RECOVER;
2396 }
2397
2398 if (conn->conn_ops->DataDigest) {
2399 u32 data_crc;
2400
2401 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2402 cmd->write_data_done, length, padding,
2403 cmd->pad_bytes);
2404
2405 if (checksum != data_crc) {
2406 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2407 " does not match computed 0x%08x\n", checksum,
2408 data_crc);
2409
2410 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2411 pr_err("Unable to recover from"
2412 " Immediate Data digest failure while"
2413 " in ERL=0.\n");
1aa58ccd 2414 iscsit_reject_cmd(cmd,
e48354ce 2415 ISCSI_REASON_DATA_DIGEST_ERROR,
1aa58ccd 2416 (unsigned char *)hdr);
e48354ce
NB		 2417 return IMMEDIATE_DATA_CANNOT_RECOVER;
2418 } else {
1aa58ccd 2419 iscsit_reject_cmd(cmd,
e48354ce 2420 ISCSI_REASON_DATA_DIGEST_ERROR,
1aa58ccd 2421 (unsigned char *)hdr);
e48354ce
NB		 2422 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2423 }
2424 } else {
2425 pr_debug("Got CRC32C DataDigest 0x%08x for"
2426 " %u bytes of Immediate Data\n", checksum,
2427 length);
2428 }
2429 }
2430
2431 cmd->write_data_done += length;
2432
ebf1d95c 2433 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2434 spin_lock_bh(&cmd->istate_lock);
2435 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2436 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2437 spin_unlock_bh(&cmd->istate_lock);
2438 }
2439
2440 return IMMEDIATE_DATA_NORMAL_OPERATION;
2441}
2442
2443/*
2444 * Called with sess->conn_lock held.
2445 */
2446/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2447 with active network interface */
2448static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2449{
2450 struct iscsi_cmd *cmd;
2451 struct iscsi_conn *conn_p;
95c1229d 2452 bool found = false;
e48354ce
NB		 2453
2454 /*
2455 * Only send a Asynchronous Message on connections whos network
2456 * interface is still functional.
2457 */
2458 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2459 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2460 iscsit_inc_conn_usage_count(conn_p);
95c1229d 2461 found = true;
e48354ce
NB		 2462 break;
2463 }
2464 }
2465
95c1229d 2466 if (!found)
e48354ce
NB		 2467 return;
2468
3c989d76 2469 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
e48354ce
NB		 2470 if (!cmd) {
2471 iscsit_dec_conn_usage_count(conn_p);
2472 return;
2473 }
2474
2475 cmd->logout_cid = conn->cid;
2476 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2477 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2478
2479 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2480 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2481 spin_unlock_bh(&conn_p->cmd_lock);
2482
2483 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2484 iscsit_dec_conn_usage_count(conn_p);
2485}
2486
2487static int iscsit_send_conn_drop_async_message(
2488 struct iscsi_cmd *cmd,
2489 struct iscsi_conn *conn)
2490{
2491 struct iscsi_async *hdr;
2492
2493 cmd->tx_size = ISCSI_HDR_LEN;
2494 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2495
2496 hdr = (struct iscsi_async *) cmd->pdu;
2497 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2498 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2499 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2500 cmd->targ_xfer_tag = 0xFFFFFFFF;
2501 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2502 cmd->stat_sn = conn->stat_sn++;
2503 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2504 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2505 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2506 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2507 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2508 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2509 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2510
2511 if (conn->conn_ops->HeaderDigest) {
2512 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2513
80690fdb
GU		 2514 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2515 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2516
2517 cmd->tx_size += ISCSI_CRC_LEN;
2518 pr_debug("Attaching CRC32C HeaderDigest to"
2519 " Async Message 0x%08x\n", *header_digest);
2520 }
2521
2522 cmd->iov_misc[0].iov_base = cmd->pdu;
2523 cmd->iov_misc[0].iov_len = cmd->tx_size;
2524 cmd->iov_misc_count = 1;
2525
2526 pr_debug("Sending Connection Dropped Async Message StatSN:"
2527 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2528 cmd->logout_cid, conn->cid);
2529 return 0;
2530}
2531
6f3c0e69
AG		 2532static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2533{
2534 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2535 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2536 wait_for_completion_interruptible_timeout(
2537 &conn->tx_half_close_comp,
2538 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2539 }
2540}
2541
2ec5a8c1
NB		 2542static void
2543iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2544 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2545 bool set_statsn)
e48354ce 2546{
2ec5a8c1
NB		 2547 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2548 hdr->flags = datain->flags;
2549 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2550 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2551 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2552 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2553 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2554 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2555 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2556 }
2557 }
2558 hton24(hdr->dlength, datain->length);
2559 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2560 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2561 (struct scsi_lun *)&hdr->lun);
2562 else
2563 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2564
2565 hdr->itt = cmd->init_task_tag;
2566
2567 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2568 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2569 else
2570 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2571 if (set_statsn)
2572 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2573 else
2574 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2575
2576 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2577 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2578 hdr->datasn = cpu_to_be32(datain->data_sn);
2579 hdr->offset = cpu_to_be32(datain->offset);
2580
2581 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2582 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2583 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2584 ntohl(hdr->offset), datain->length, conn->cid);
2585}
2586
2587static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2588{
2589 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2590 struct iscsi_datain datain;
2591 struct iscsi_datain_req *dr;
e48354ce 2592 struct kvec *iov;
2ec5a8c1
NB		 2593 u32 iov_count = 0, tx_size = 0;
2594 int eodr = 0, ret, iov_ret;
2595 bool set_statsn = false;
e48354ce
NB		 2596
2597 memset(&datain, 0, sizeof(struct iscsi_datain));
2598 dr = iscsit_get_datain_values(cmd, &datain);
2599 if (!dr) {
2600 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2601 cmd->init_task_tag);
2602 return -1;
2603 }
e48354ce
NB		 2604 /*
2605 * Be paranoid and double check the logic for now.
2606 */
ebf1d95c 2607 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2608 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2609 " datain.length: %u exceeds cmd->data_length: %u\n",
2610 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2611 cmd->se_cmd.data_length);
e48354ce
NB		 2612 return -1;
2613 }
2614
2615 spin_lock_bh(&conn->sess->session_stats_lock);
2616 conn->sess->tx_data_octets += datain.length;
2617 if (conn->sess->se_sess->se_node_acl) {
2618 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2619 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2620 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2621 }
2622 spin_unlock_bh(&conn->sess->session_stats_lock);
2623 /*
2624 * Special case for successfully execution w/ both DATAIN
2625 * and Sense Data.
2626 */
2627 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2628 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2629 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2630 else {
2631 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2632 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2633 iscsit_increment_maxcmdsn(cmd, conn->sess);
2634 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2635 set_statsn = true;
e48354ce 2636 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2637 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2638 set_statsn = true;
e48354ce
NB		 2639 }
2640
2ec5a8c1 2641 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2642
2643 iov = &cmd->iov_data[0];
2644 iov[iov_count].iov_base = cmd->pdu;
2645 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2646 tx_size += ISCSI_HDR_LEN;
2647
2648 if (conn->conn_ops->HeaderDigest) {
2649 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2650
80690fdb
GU		 2651 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2652 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2653
2654 iov[0].iov_len += ISCSI_CRC_LEN;
2655 tx_size += ISCSI_CRC_LEN;
2656
2657 pr_debug("Attaching CRC32 HeaderDigest"
2658 " for DataIN PDU 0x%08x\n", *header_digest);
2659 }
2660
2ec5a8c1
NB		 2661 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2662 datain.offset, datain.length);
e48354ce
NB		 2663 if (iov_ret < 0)
2664 return -1;
2665
2666 iov_count += iov_ret;
2667 tx_size += datain.length;
2668
2669 cmd->padding = ((-datain.length) & 3);
2670 if (cmd->padding) {
2671 iov[iov_count].iov_base = cmd->pad_bytes;
2672 iov[iov_count++].iov_len = cmd->padding;
2673 tx_size += cmd->padding;
2674
2675 pr_debug("Attaching %u padding bytes\n",
2676 cmd->padding);
2677 }
2678 if (conn->conn_ops->DataDigest) {
2679 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2680 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2681
2682 iov[iov_count].iov_base = &cmd->data_crc;
2683 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2684 tx_size += ISCSI_CRC_LEN;
2685
2686 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2687 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2688 }
2689
2690 cmd->iov_data_count = iov_count;
2691 cmd->tx_size = tx_size;
2692
6f3c0e69
AG		 2693 /* sendpage is preferred but can't insert markers */
2694 if (!conn->conn_ops->IFMarker)
2695 ret = iscsit_fe_sendpage_sg(cmd, conn);
2696 else
2697 ret = iscsit_send_tx_data(cmd, conn, 0);
2698
2699 iscsit_unmap_iovec(cmd);
2700
2701 if (ret < 0) {
2702 iscsit_tx_thread_wait_for_tcp(conn);
2703 return ret;
2704 }
2705
e48354ce 2706 if (dr->dr_complete) {
6f3c0e69 2707 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2708 2 : 1;
2709 iscsit_free_datain_req(cmd, dr);
2710 }
2711
6f3c0e69 2712 return eodr;
e48354ce
NB		 2713}
2714
2ec5a8c1
NB		 2715int
2716iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2717 struct iscsi_logout_rsp *hdr)
e48354ce 2718{
e48354ce
NB		 2719 struct iscsi_conn *logout_conn = NULL;
2720 struct iscsi_conn_recovery *cr = NULL;
2721 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2722 /*
2723 * The actual shutting down of Sessions and/or Connections
2724 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2725 * is done in scsi_logout_post_handler().
2726 */
2727 switch (cmd->logout_reason) {
2728 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2729 pr_debug("iSCSI session logout successful, setting"
2730 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2731 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2732 break;
2733 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2734 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2735 break;
2736 /*
2737 * For CLOSECONNECTION logout requests carrying
2738 * a matching logout CID -> local CID, the reference
2739 * for the local CID will have been incremented in
2740 * iscsi_logout_closeconnection().
2741 *
2742 * For CLOSECONNECTION logout requests carrying
2743 * a different CID than the connection it arrived
2744 * on, the connection responding to cmd->logout_cid
2745 * is stopped in iscsit_logout_post_handler_diffcid().
2746 */
2747
2748 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2749 " successful.\n", cmd->logout_cid, conn->cid);
2750 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2751 break;
2752 case ISCSI_LOGOUT_REASON_RECOVERY:
2753 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2754 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2755 break;
2756 /*
2757 * If the connection is still active from our point of view
2758 * force connection recovery to occur.
2759 */
2760 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2761 cmd->logout_cid);
ee1b1b9c 2762 if (logout_conn) {
e48354ce
NB		 2763 iscsit_connection_reinstatement_rcfr(logout_conn);
2764 iscsit_dec_conn_usage_count(logout_conn);
2765 }
2766
2767 cr = iscsit_get_inactive_connection_recovery_entry(
2768 conn->sess, cmd->logout_cid);
2769 if (!cr) {
2770 pr_err("Unable to locate CID: %hu for"
2771 " REMOVECONNFORRECOVERY Logout Request.\n",
2772 cmd->logout_cid);
2773 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2774 break;
2775 }
2776
2777 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2778
2779 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2780 " for recovery for CID: %hu on CID: %hu successful.\n",
2781 cmd->logout_cid, conn->cid);
2782 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2783 break;
2784 default:
2785 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2786 cmd->logout_reason);
2787 return -1;
2788 }
2789
e48354ce
NB		 2790 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2791 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2792 hdr->response = cmd->logout_response;
66c7db68 2793 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2794 cmd->stat_sn = conn->stat_sn++;
2795 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2796
2797 iscsit_increment_maxcmdsn(cmd, conn->sess);
2798 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2799 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2800
2ec5a8c1
NB		 2801 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2802 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2803 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2804 cmd->logout_cid, conn->cid);
2805
2806 return 0;
2807}
2808EXPORT_SYMBOL(iscsit_build_logout_rsp);
2809
2810static int
2811iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2812{
2813 struct kvec *iov;
2814 int niov = 0, tx_size, rc;
2815
2816 rc = iscsit_build_logout_rsp(cmd, conn,
2817 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2818 if (rc < 0)
2819 return rc;
2820
2821 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2822 iov = &cmd->iov_misc[0];
2823 iov[niov].iov_base = cmd->pdu;
2824 iov[niov++].iov_len = ISCSI_HDR_LEN;
2825
2826 if (conn->conn_ops->HeaderDigest) {
2827 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2828
80690fdb
GU		 2829 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2830 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2831
2832 iov[0].iov_len += ISCSI_CRC_LEN;
2833 tx_size += ISCSI_CRC_LEN;
2834 pr_debug("Attaching CRC32C HeaderDigest to"
2835 " Logout Response 0x%08x\n", *header_digest);
2836 }
2837 cmd->iov_misc_count = niov;
2838 cmd->tx_size = tx_size;
2839
e48354ce
NB		 2840 return 0;
2841}
2842
2ec5a8c1
NB		 2843void
2844iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2845 struct iscsi_nopin *hdr, bool nopout_response)
2846{
2847 hdr->opcode = ISCSI_OP_NOOP_IN;
2848 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2849 hton24(hdr->dlength, cmd->buf_ptr_size);
2850 if (nopout_response)
2851 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2852 hdr->itt = cmd->init_task_tag;
2853 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2854 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2855 conn->stat_sn;
2856 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2857
2858 if (nopout_response)
2859 iscsit_increment_maxcmdsn(cmd, conn->sess);
2860
2861 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2862 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2863
2864 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2865 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2866 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2867 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2868}
2869EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2870
e48354ce
NB		 2871/*
2872 * Unsolicited NOPIN, either requesting a response or not.
2873 */
2874static int iscsit_send_unsolicited_nopin(
2875 struct iscsi_cmd *cmd,
2876 struct iscsi_conn *conn,
2877 int want_response)
2878{
2ec5a8c1
NB		 2879 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2880 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2881
2ec5a8c1 2882 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2883
2884 if (conn->conn_ops->HeaderDigest) {
2885 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2886
80690fdb
GU		 2887 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2888 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2889
2890 tx_size += ISCSI_CRC_LEN;
2891 pr_debug("Attaching CRC32C HeaderDigest to"
2892 " NopIN 0x%08x\n", *header_digest);
2893 }
2894
2895 cmd->iov_misc[0].iov_base = cmd->pdu;
2896 cmd->iov_misc[0].iov_len = tx_size;
2897 cmd->iov_misc_count = 1;
2898 cmd->tx_size = tx_size;
2899
2900 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2901 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2902
6f3c0e69
AG		 2903 ret = iscsit_send_tx_data(cmd, conn, 1);
2904 if (ret < 0) {
2905 iscsit_tx_thread_wait_for_tcp(conn);
2906 return ret;
2907 }
2908
2909 spin_lock_bh(&cmd->istate_lock);
2910 cmd->i_state = want_response ?
2911 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2912 spin_unlock_bh(&cmd->istate_lock);
2913
e48354ce
NB		 2914 return 0;
2915}
2916
2ec5a8c1
NB		 2917static int
2918iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2919{
2ec5a8c1 2920 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2921 struct kvec *iov;
2ec5a8c1
NB		 2922 u32 padding = 0;
2923 int niov = 0, tx_size;
e48354ce 2924
2ec5a8c1 2925 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2926
2ec5a8c1 2927 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2928 iov = &cmd->iov_misc[0];
2929 iov[niov].iov_base = cmd->pdu;
2930 iov[niov++].iov_len = ISCSI_HDR_LEN;
2931
2932 if (conn->conn_ops->HeaderDigest) {
2933 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2934
80690fdb
GU		 2935 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2936 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2937
2938 iov[0].iov_len += ISCSI_CRC_LEN;
2939 tx_size += ISCSI_CRC_LEN;
2940 pr_debug("Attaching CRC32C HeaderDigest"
2941 " to NopIn 0x%08x\n", *header_digest);
2942 }
2943
2944 /*
2945 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2946 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2947 */
2948 if (cmd->buf_ptr_size) {
2949 iov[niov].iov_base = cmd->buf_ptr;
2950 iov[niov++].iov_len = cmd->buf_ptr_size;
2951 tx_size += cmd->buf_ptr_size;
2952
2953 pr_debug("Echoing back %u bytes of ping"
2954 " data.\n", cmd->buf_ptr_size);
2955
2956 padding = ((-cmd->buf_ptr_size) & 3);
2957 if (padding != 0) {
2958 iov[niov].iov_base = &cmd->pad_bytes;
2959 iov[niov++].iov_len = padding;
2960 tx_size += padding;
2961 pr_debug("Attaching %u additional"
2962 " padding bytes.\n", padding);
2963 }
2964 if (conn->conn_ops->DataDigest) {
2965 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2966 cmd->buf_ptr, cmd->buf_ptr_size,
2967 padding, (u8 *)&cmd->pad_bytes,
2968 (u8 *)&cmd->data_crc);
2969
2970 iov[niov].iov_base = &cmd->data_crc;
2971 iov[niov++].iov_len = ISCSI_CRC_LEN;
2972 tx_size += ISCSI_CRC_LEN;
2973 pr_debug("Attached DataDigest for %u"
2974 " bytes of ping data, CRC 0x%08x\n",
2975 cmd->buf_ptr_size, cmd->data_crc);
2976 }
2977 }
2978
2979 cmd->iov_misc_count = niov;
2980 cmd->tx_size = tx_size;
2981
e48354ce
NB		 2982 return 0;
2983}
2984
6f3c0e69 2985static int iscsit_send_r2t(
e48354ce
NB		 2986 struct iscsi_cmd *cmd,
2987 struct iscsi_conn *conn)
2988{
2989 int tx_size = 0;
2990 struct iscsi_r2t *r2t;
2991 struct iscsi_r2t_rsp *hdr;
6f3c0e69 2992 int ret;
e48354ce
NB		 2993
2994 r2t = iscsit_get_r2t_from_list(cmd);
2995 if (!r2t)
2996 return -1;
2997
2998 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2999 memset(hdr, 0, ISCSI_HDR_LEN);
3000 hdr->opcode = ISCSI_OP_R2T;
3001 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3002 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3003 (struct scsi_lun *)&hdr->lun);
66c7db68 3004 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3005 spin_lock_bh(&conn->sess->ttt_lock);
3006 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3007 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3008 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3009 spin_unlock_bh(&conn->sess->ttt_lock);
3010 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3011 hdr->statsn = cpu_to_be32(conn->stat_sn);
3012 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3013 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3014 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3015 hdr->data_offset = cpu_to_be32(r2t->offset);
3016 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3017
3018 cmd->iov_misc[0].iov_base = cmd->pdu;
3019 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3020 tx_size += ISCSI_HDR_LEN;
3021
3022 if (conn->conn_ops->HeaderDigest) {
3023 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3024
80690fdb
GU		 3025 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3026 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3027
3028 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3029 tx_size += ISCSI_CRC_LEN;
3030 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3031 " PDU 0x%08x\n", *header_digest);
3032 }
3033
3034 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3035 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3036 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3037 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3038 r2t->offset, r2t->xfer_len, conn->cid);
3039
3040 cmd->iov_misc_count = 1;
3041 cmd->tx_size = tx_size;
3042
3043 spin_lock_bh(&cmd->r2t_lock);
3044 r2t->sent_r2t = 1;
3045 spin_unlock_bh(&cmd->r2t_lock);
3046
6f3c0e69
AG		 3047 ret = iscsit_send_tx_data(cmd, conn, 1);
3048 if (ret < 0) {
3049 iscsit_tx_thread_wait_for_tcp(conn);
3050 return ret;
3051 }
3052
3053 spin_lock_bh(&cmd->dataout_timeout_lock);
3054 iscsit_start_dataout_timer(cmd, conn);
3055 spin_unlock_bh(&cmd->dataout_timeout_lock);
3056
e48354ce
NB		 3057 return 0;
3058}
3059
3060/*
8b1e1244
AG		 3061 * @recovery: If called from iscsi_task_reassign_complete_write() for
3062 * connection recovery.
e48354ce
NB		 3063 */
3064int iscsit_build_r2ts_for_cmd(
e48354ce 3065 struct iscsi_conn *conn,
3e1c81a9 3066 struct iscsi_cmd *cmd,
8b1e1244 3067 bool recovery)
e48354ce
NB		 3068{
3069 int first_r2t = 1;
3070 u32 offset = 0, xfer_len = 0;
3071
3072 spin_lock_bh(&cmd->r2t_lock);
3073 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3074 spin_unlock_bh(&cmd->r2t_lock);
3075 return 0;
3076 }
3077
8b1e1244
AG		 3078 if (conn->sess->sess_ops->DataSequenceInOrder &&
3079 !recovery)
c6037cc5 3080 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3081
3082 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3083 if (conn->sess->sess_ops->DataSequenceInOrder) {
3084 offset = cmd->r2t_offset;
3085
8b1e1244
AG		 3086 if (first_r2t && recovery) {
3087 int new_data_end = offset +
3088 conn->sess->sess_ops->MaxBurstLength -
3089 cmd->next_burst_len;
3090
ebf1d95c
AG		 3091 if (new_data_end > cmd->se_cmd.data_length)
3092 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3093 else
3094 xfer_len =
3095 conn->sess->sess_ops->MaxBurstLength -
3096 cmd->next_burst_len;
e48354ce 3097 } else {
8b1e1244
AG		 3098 int new_data_end = offset +
3099 conn->sess->sess_ops->MaxBurstLength;
3100
ebf1d95c
AG		 3101 if (new_data_end > cmd->se_cmd.data_length)
3102 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3103 else
3104 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3105 }
3106 cmd->r2t_offset += xfer_len;
3107
ebf1d95c 3108 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3109 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3110 } else {
3111 struct iscsi_seq *seq;
3112
3113 seq = iscsit_get_seq_holder_for_r2t(cmd);
3114 if (!seq) {
3115 spin_unlock_bh(&cmd->r2t_lock);
3116 return -1;
3117 }
3118
3119 offset = seq->offset;
3120 xfer_len = seq->xfer_len;
3121
3122 if (cmd->seq_send_order == cmd->seq_count)
3123 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3124 }
3125 cmd->outstanding_r2ts++;
3126 first_r2t = 0;
3127
3128 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3129 spin_unlock_bh(&cmd->r2t_lock);
3130 return -1;
3131 }
3132
3133 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3134 break;
3135 }
3136 spin_unlock_bh(&cmd->r2t_lock);
3137
3138 return 0;
3139}
3140
2ec5a8c1
NB		 3141void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3142 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3143{
2ec5a8c1 3144 if (inc_stat_sn)
e48354ce
NB		 3145 cmd->stat_sn = conn->stat_sn++;
3146
3147 spin_lock_bh(&conn->sess->session_stats_lock);
3148 conn->sess->rsp_pdus++;
3149 spin_unlock_bh(&conn->sess->session_stats_lock);
3150
e48354ce
NB		 3151 memset(hdr, 0, ISCSI_HDR_LEN);
3152 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3153 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3154 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3155 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3156 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3157 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3158 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3159 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3160 }
3161 hdr->response = cmd->iscsi_response;
3162 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3163 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3164 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3165
3166 iscsit_increment_maxcmdsn(cmd, conn->sess);
3167 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3168 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3169
2ec5a8c1
NB		 3170 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3171 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3172 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3173 cmd->se_cmd.scsi_status, conn->cid);
3174}
3175EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3176
3177static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3178{
3179 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3180 struct kvec *iov;
3181 u32 padding = 0, tx_size = 0;
3182 int iov_count = 0;
3183 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3184
3185 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3186
e48354ce
NB		 3187 iov = &cmd->iov_misc[0];
3188 iov[iov_count].iov_base = cmd->pdu;
3189 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3190 tx_size += ISCSI_HDR_LEN;
3191
3192 /*
3193 * Attach SENSE DATA payload to iSCSI Response PDU
3194 */
3195 if (cmd->se_cmd.sense_buffer &&
3196 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3197 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3198 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3199 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3200
e48354ce 3201 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3202 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3203 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3204 iov[iov_count++].iov_len =
3205 (cmd->se_cmd.scsi_sense_length + padding);
3206 tx_size += cmd->se_cmd.scsi_sense_length;
3207
3208 if (padding) {
9c58b7dd 3209 memset(cmd->sense_buffer +
e48354ce
NB		 3210 cmd->se_cmd.scsi_sense_length, 0, padding);
3211 tx_size += padding;
3212 pr_debug("Adding %u bytes of padding to"
3213 " SENSE.\n", padding);
3214 }
3215
3216 if (conn->conn_ops->DataDigest) {
3217 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3218 cmd->sense_buffer,
e48354ce
NB		 3219 (cmd->se_cmd.scsi_sense_length + padding),
3220 0, NULL, (u8 *)&cmd->data_crc);
3221
3222 iov[iov_count].iov_base = &cmd->data_crc;
3223 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3224 tx_size += ISCSI_CRC_LEN;
3225
3226 pr_debug("Attaching CRC32 DataDigest for"
3227 " SENSE, %u bytes CRC 0x%08x\n",
3228 (cmd->se_cmd.scsi_sense_length + padding),
3229 cmd->data_crc);
3230 }
3231
3232 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3233 " Response PDU\n",
3234 cmd->se_cmd.scsi_sense_length);
3235 }
3236
3237 if (conn->conn_ops->HeaderDigest) {
3238 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3239
80690fdb
GU		 3240 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3241 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3242
3243 iov[0].iov_len += ISCSI_CRC_LEN;
3244 tx_size += ISCSI_CRC_LEN;
3245 pr_debug("Attaching CRC32 HeaderDigest for Response"
3246 " PDU 0x%08x\n", *header_digest);
3247 }
3248
3249 cmd->iov_misc_count = iov_count;
3250 cmd->tx_size = tx_size;
3251
e48354ce
NB		 3252 return 0;
3253}
3254
3255static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3256{
3257 switch (se_tmr->response) {
3258 case TMR_FUNCTION_COMPLETE:
3259 return ISCSI_TMF_RSP_COMPLETE;
3260 case TMR_TASK_DOES_NOT_EXIST:
3261 return ISCSI_TMF_RSP_NO_TASK;
3262 case TMR_LUN_DOES_NOT_EXIST:
3263 return ISCSI_TMF_RSP_NO_LUN;
3264 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3265 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3266 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3267 return ISCSI_TMF_RSP_AUTH_FAILED;
3268 case TMR_FUNCTION_REJECTED:
3269 default:
3270 return ISCSI_TMF_RSP_REJECTED;
3271 }
3272}
3273
2ec5a8c1
NB		 3274void
3275iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3276 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3277{
3278 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3279
e48354ce 3280 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3281 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3282 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3283 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3284 cmd->stat_sn = conn->stat_sn++;
3285 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3286
3287 iscsit_increment_maxcmdsn(cmd, conn->sess);
3288 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3289 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3290
2ec5a8c1
NB		 3291 pr_debug("Built Task Management Response ITT: 0x%08x,"
3292 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3293 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3294}
3295EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3296
3297static int
3298iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3299{
3300 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3301 u32 tx_size = 0;
3302
3303 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3304
e48354ce
NB		 3305 cmd->iov_misc[0].iov_base = cmd->pdu;
3306 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3307 tx_size += ISCSI_HDR_LEN;
3308
3309 if (conn->conn_ops->HeaderDigest) {
3310 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3311
80690fdb
GU		 3312 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3313 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3314
3315 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3316 tx_size += ISCSI_CRC_LEN;
3317 pr_debug("Attaching CRC32 HeaderDigest for Task"
3318 " Mgmt Response PDU 0x%08x\n", *header_digest);
3319 }
3320
3321 cmd->iov_misc_count = 1;
3322 cmd->tx_size = tx_size;
3323
e48354ce
NB		 3324 return 0;
3325}
3326
2f9bc894
NB		 3327static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3328{
3329 bool ret = false;
3330
3331 if (np->np_sockaddr.ss_family == AF_INET6) {
3332 const struct sockaddr_in6 sin6 = {
3333 .sin6_addr = IN6ADDR_ANY_INIT };
3334 struct sockaddr_in6 *sock_in6 =
3335 (struct sockaddr_in6 *)&np->np_sockaddr;
3336
3337 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3338 sin6.sin6_addr.s6_addr, 16))
3339 ret = true;
3340 } else {
3341 struct sockaddr_in * sock_in =
3342 (struct sockaddr_in *)&np->np_sockaddr;
3343
cea0b4ce 3344 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3345 ret = true;
3346 }
3347
3348 return ret;
3349}
3350
8b1e1244
AG		 3351#define SENDTARGETS_BUF_LIMIT 32768U
3352
e48354ce
NB		 3353static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3354{
3355 char *payload = NULL;
3356 struct iscsi_conn *conn = cmd->conn;
3357 struct iscsi_portal_group *tpg;
3358 struct iscsi_tiqn *tiqn;
3359 struct iscsi_tpg_np *tpg_np;
3360 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
8b1e1244 3361 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
e48354ce 3362
8b1e1244
AG		 3363 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3364 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3365
3366 payload = kzalloc(buffer_len, GFP_KERNEL);
3367 if (!payload) {
3368 pr_err("Unable to allocate memory for sendtargets"
3369 " response.\n");
3370 return -ENOMEM;
3371 }
3372
3373 spin_lock(&tiqn_lock);
3374 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3375 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3376 len += 1;
3377
3378 if ((len + payload_len) > buffer_len) {
e48354ce
NB		 3379 end_of_buf = 1;
3380 goto eob;
3381 }
8359cf43 3382 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3383 payload_len += len;
3384
3385 spin_lock(&tiqn->tiqn_tpg_lock);
3386 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3387
3388 spin_lock(&tpg->tpg_state_lock);
3389 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3390 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3391 spin_unlock(&tpg->tpg_state_lock);
3392 continue;
3393 }
3394 spin_unlock(&tpg->tpg_state_lock);
3395
3396 spin_lock(&tpg->tpg_np_lock);
3397 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3398 tpg_np_list) {
2f9bc894
NB		 3399 struct iscsi_np *np = tpg_np->tpg_np;
3400 bool inaddr_any = iscsit_check_inaddr_any(np);
3401
e48354ce
NB		 3402 len = sprintf(buf, "TargetAddress="
3403 "%s%s%s:%hu,%hu",
2f9bc894
NB		 3404 (np->np_sockaddr.ss_family == AF_INET6) ?
3405 "[" : "", (inaddr_any == false) ?
3406 np->np_ip : conn->local_ip,
3407 (np->np_sockaddr.ss_family == AF_INET6) ?
3408 "]" : "", (inaddr_any == false) ?
3409 np->np_port : conn->local_port,
e48354ce
NB		 3410 tpg->tpgt);
3411 len += 1;
3412
3413 if ((len + payload_len) > buffer_len) {
3414 spin_unlock(&tpg->tpg_np_lock);
3415 spin_unlock(&tiqn->tiqn_tpg_lock);
3416 end_of_buf = 1;
3417 goto eob;
3418 }
8359cf43 3419 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3420 payload_len += len;
3421 }
3422 spin_unlock(&tpg->tpg_np_lock);
3423 }
3424 spin_unlock(&tiqn->tiqn_tpg_lock);
3425eob:
3426 if (end_of_buf)
3427 break;
3428 }
3429 spin_unlock(&tiqn_lock);
3430
3431 cmd->buf_ptr = payload;
3432
3433 return payload_len;
3434}
3435
3436/*
3437 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3438 * MaxRecvDataSegmentLength.
3439 */
3440static int iscsit_send_text_rsp(
3441 struct iscsi_cmd *cmd,
3442 struct iscsi_conn *conn)
3443{
3444 struct iscsi_text_rsp *hdr;
3445 struct kvec *iov;
3446 u32 padding = 0, tx_size = 0;
3447 int text_length, iov_count = 0;
3448
3449 text_length = iscsit_build_sendtargets_response(cmd);
3450 if (text_length < 0)
3451 return text_length;
3452
3453 padding = ((-text_length) & 3);
3454 if (padding != 0) {
3455 memset(cmd->buf_ptr + text_length, 0, padding);
3456 pr_debug("Attaching %u additional bytes for"
3457 " padding.\n", padding);
3458 }
3459
3460 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3461 memset(hdr, 0, ISCSI_HDR_LEN);
3462 hdr->opcode = ISCSI_OP_TEXT_RSP;
3463 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3464 hton24(hdr->dlength, text_length);
66c7db68 3465 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3466 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3467 cmd->stat_sn = conn->stat_sn++;
3468 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3469
3470 iscsit_increment_maxcmdsn(cmd, conn->sess);
3471 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3472 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3473
3474 iov = &cmd->iov_misc[0];
3475
3476 iov[iov_count].iov_base = cmd->pdu;
3477 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3478 iov[iov_count].iov_base = cmd->buf_ptr;
3479 iov[iov_count++].iov_len = text_length + padding;
3480
3481 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3482
3483 if (conn->conn_ops->HeaderDigest) {
3484 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3485
80690fdb
GU		 3486 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3487 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3488
3489 iov[0].iov_len += ISCSI_CRC_LEN;
3490 tx_size += ISCSI_CRC_LEN;
3491 pr_debug("Attaching CRC32 HeaderDigest for"
3492 " Text Response PDU 0x%08x\n", *header_digest);
3493 }
3494
3495 if (conn->conn_ops->DataDigest) {
3496 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3497 cmd->buf_ptr, (text_length + padding),
3498 0, NULL, (u8 *)&cmd->data_crc);
3499
3500 iov[iov_count].iov_base = &cmd->data_crc;
3501 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3502 tx_size += ISCSI_CRC_LEN;
3503
3504 pr_debug("Attaching DataDigest for %u bytes of text"
3505 " data, CRC 0x%08x\n", (text_length + padding),
3506 cmd->data_crc);
3507 }
3508
3509 cmd->iov_misc_count = iov_count;
3510 cmd->tx_size = tx_size;
3511
3512 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3513 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3514 text_length, conn->cid);
3515 return 0;
3516}
3517
2ec5a8c1
NB		 3518void
3519iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3520 struct iscsi_reject *hdr)
3521{
3522 hdr->opcode = ISCSI_OP_REJECT;
1aa58ccd 3523 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3524 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3525 hton24(hdr->dlength, ISCSI_HDR_LEN);
3526 hdr->ffffffff = cpu_to_be32(0xffffffff);
3527 cmd->stat_sn = conn->stat_sn++;
3528 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3529 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3530 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3531
3532}
3533EXPORT_SYMBOL(iscsit_build_reject);
3534
e48354ce
NB		 3535static int iscsit_send_reject(
3536 struct iscsi_cmd *cmd,
3537 struct iscsi_conn *conn)
3538{
bfbdb31d 3539 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3540 struct kvec *iov;
bfbdb31d 3541 u32 iov_count = 0, tx_size;
e48354ce 3542
bfbdb31d 3543 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3544
3545 iov = &cmd->iov_misc[0];
e48354ce
NB		 3546 iov[iov_count].iov_base = cmd->pdu;
3547 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3548 iov[iov_count].iov_base = cmd->buf_ptr;
3549 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3550
3551 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3552
3553 if (conn->conn_ops->HeaderDigest) {
3554 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3555
80690fdb
GU		 3556 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3557 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3558
3559 iov[0].iov_len += ISCSI_CRC_LEN;
3560 tx_size += ISCSI_CRC_LEN;
3561 pr_debug("Attaching CRC32 HeaderDigest for"
3562 " REJECT PDU 0x%08x\n", *header_digest);
3563 }
3564
3565 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3566 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3567 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3568
3569 iov[iov_count].iov_base = &cmd->data_crc;
3570 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3571 tx_size += ISCSI_CRC_LEN;
3572 pr_debug("Attaching CRC32 DataDigest for REJECT"
3573 " PDU 0x%08x\n", cmd->data_crc);
3574 }
3575
3576 cmd->iov_misc_count = iov_count;
3577 cmd->tx_size = tx_size;
3578
3579 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3580 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3581
3582 return 0;
3583}
3584
e48354ce
NB		 3585void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3586{
e48354ce
NB		 3587 int ord, cpu;
3588 /*
49b028d3
NB		 3589 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3590 * within iscsit_start_kthreads()
e48354ce 3591 *
49b028d3
NB		 3592 * Here we use bitmap_id to determine which CPU that this
3593 * iSCSI connection's RX/TX threads will be scheduled to
e48354ce
NB		 3594 * execute upon.
3595 */
49b028d3 3596 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3597 for_each_online_cpu(cpu) {
3598 if (ord-- == 0) {
3599 cpumask_set_cpu(cpu, conn->conn_cpumask);
3600 return;
3601 }
3602 }
3603 /*
3604 * This should never be reached..
3605 */
3606 dump_stack();
3607 cpumask_setall(conn->conn_cpumask);
3608}
3609
3610static inline void iscsit_thread_check_cpumask(
3611 struct iscsi_conn *conn,
3612 struct task_struct *p,
3613 int mode)
3614{
3615 char buf[128];
3616 /*
3617 * mode == 1 signals iscsi_target_tx_thread() usage.
3618 * mode == 0 signals iscsi_target_rx_thread() usage.
3619 */
3620 if (mode == 1) {
3621 if (!conn->conn_tx_reset_cpumask)
3622 return;
3623 conn->conn_tx_reset_cpumask = 0;
3624 } else {
3625 if (!conn->conn_rx_reset_cpumask)
3626 return;
3627 conn->conn_rx_reset_cpumask = 0;
3628 }
3629 /*
3630 * Update the CPU mask for this single kthread so that
3631 * both TX and RX kthreads are scheduled to run on the
3632 * same CPU.
3633 */
3634 memset(buf, 0, 128);
3635 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3636 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3637}
3638
2ec5a8c1
NB		 3639static int
3640iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3641{
6f3c0e69
AG		 3642 int ret;
3643
2ec5a8c1
NB		 3644 switch (state) {
3645 case ISTATE_SEND_R2T:
3646 ret = iscsit_send_r2t(cmd, conn);
3647 if (ret < 0)
3648 goto err;
3649 break;
3650 case ISTATE_REMOVE:
3651 spin_lock_bh(&conn->cmd_lock);
af737f67 3652 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3653 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3654
aafc9d15 3655 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3656 break;
3657 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3658 iscsit_mod_nopin_response_timer(conn);
3659 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3660 if (ret < 0)
6f3c0e69 3661 goto err;
2ec5a8c1
NB		 3662 break;
3663 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3664 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3665 if (ret < 0)
3666 goto err;
3667 break;
3668 default:
3669 pr_err("Unknown Opcode: 0x%02x ITT:"
3670 " 0x%08x, i_state: %d on CID: %hu\n",
3671 cmd->iscsi_opcode, cmd->init_task_tag, state,
3672 conn->cid);
3673 goto err;
6f3c0e69
AG		 3674 }
3675
3676 return 0;
3677
3678err:
3679 return -1;
3680}
3681
2ec5a8c1
NB		 3682static int
3683iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3684{
2ec5a8c1 3685 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3686 struct iscsi_queue_req *qr;
3687 struct iscsi_cmd *cmd;
3688 u8 state;
3689 int ret;
3690
2ec5a8c1
NB		 3691 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3692 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3693 cmd = qr->cmd;
3694 state = qr->state;
3695 kmem_cache_free(lio_qr_cache, qr);
3696
2ec5a8c1
NB		 3697 ret = t->iscsit_immediate_queue(conn, cmd, state);
3698 if (ret < 0)
3699 return ret;
3700 }
fd3a9025 3701
2ec5a8c1
NB		 3702 return 0;
3703}
6f3c0e69 3704
2ec5a8c1
NB		 3705static int
3706iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3707{
3708 int ret;
3709
3710check_rsp_state:
3711 switch (state) {
3712 case ISTATE_SEND_DATAIN:
3713 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3714 if (ret < 0)
3715 goto err;
2ec5a8c1
NB		 3716 else if (!ret)
3717 /* more drs */
3718 goto check_rsp_state;
3719 else if (ret == 1) {
3720 /* all done */
3721 spin_lock_bh(&cmd->istate_lock);
3722 cmd->i_state = ISTATE_SENT_STATUS;
3723 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3724
2ec5a8c1
NB		 3725 if (atomic_read(&conn->check_immediate_queue))
3726 return 1;
6f3c0e69 3727
2ec5a8c1
NB		 3728 return 0;
3729 } else if (ret == 2) {
3730 /* Still must send status,
3731 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3732 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3733 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3734 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3735 state = ISTATE_SEND_STATUS;
3736 goto check_rsp_state;
3737 }
3738
3739 break;
3740 case ISTATE_SEND_STATUS:
3741 case ISTATE_SEND_STATUS_RECOVERY:
3742 ret = iscsit_send_response(cmd, conn);
3743 break;
3744 case ISTATE_SEND_LOGOUTRSP:
3745 ret = iscsit_send_logout(cmd, conn);
3746 break;
3747 case ISTATE_SEND_ASYNCMSG:
3748 ret = iscsit_send_conn_drop_async_message(
3749 cmd, conn);
3750 break;
3751 case ISTATE_SEND_NOPIN:
3752 ret = iscsit_send_nopin(cmd, conn);
3753 break;
3754 case ISTATE_SEND_REJECT:
3755 ret = iscsit_send_reject(cmd, conn);
3756 break;
3757 case ISTATE_SEND_TASKMGTRSP:
3758 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3759 if (ret != 0)
6f3c0e69 3760 break;
2ec5a8c1
NB		 3761 ret = iscsit_tmr_post_handler(cmd, conn);
3762 if (ret != 0)
3763 iscsit_fall_back_to_erl0(conn->sess);
3764 break;
3765 case ISTATE_SEND_TEXTRSP:
3766 ret = iscsit_send_text_rsp(cmd, conn);
3767 break;
3768 default:
3769 pr_err("Unknown Opcode: 0x%02x ITT:"
3770 " 0x%08x, i_state: %d on CID: %hu\n",
3771 cmd->iscsi_opcode, cmd->init_task_tag,
3772 state, conn->cid);
3773 goto err;
3774 }
3775 if (ret < 0)
3776 goto err;
3777
3778 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3779 iscsit_tx_thread_wait_for_tcp(conn);
3780 iscsit_unmap_iovec(cmd);
3781 goto err;
3782 }
3783 iscsit_unmap_iovec(cmd);
3784
3785 switch (state) {
3786 case ISTATE_SEND_LOGOUTRSP:
3787 if (!iscsit_logout_post_handler(cmd, conn))
49b028d3 3788 return -ECONNRESET;
2ec5a8c1
NB		 3789 /* fall through */
3790 case ISTATE_SEND_STATUS:
3791 case ISTATE_SEND_ASYNCMSG:
3792 case ISTATE_SEND_NOPIN:
3793 case ISTATE_SEND_STATUS_RECOVERY:
3794 case ISTATE_SEND_TEXTRSP:
3795 case ISTATE_SEND_TASKMGTRSP:
1aa58ccd 3796 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3797 spin_lock_bh(&cmd->istate_lock);
3798 cmd->i_state = ISTATE_SENT_STATUS;
3799 spin_unlock_bh(&cmd->istate_lock);
3800 break;
2ec5a8c1
NB		 3801 default:
3802 pr_err("Unknown Opcode: 0x%02x ITT:"
3803 " 0x%08x, i_state: %d on CID: %hu\n",
3804 cmd->iscsi_opcode, cmd->init_task_tag,
3805 cmd->i_state, conn->cid);
3806 goto err;
6f3c0e69
AG		 3807 }
3808
2ec5a8c1
NB		 3809 if (atomic_read(&conn->check_immediate_queue))
3810 return 1;
3811
6f3c0e69
AG		 3812 return 0;
3813
3814err:
3815 return -1;
6f3c0e69
AG		 3816}
3817
2ec5a8c1
NB		 3818static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3819{
3820 struct iscsit_transport *t = conn->conn_transport;
3821 struct iscsi_queue_req *qr;
3822 struct iscsi_cmd *cmd;
3823 u8 state;
3824 int ret;
3825
3826 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3827 cmd = qr->cmd;
3828 state = qr->state;
3829 kmem_cache_free(lio_qr_cache, qr);
3830
3831 ret = t->iscsit_response_queue(conn, cmd, state);
3832 if (ret == 1 || ret < 0)
3833 return ret;
3834 }
3835
3836 return 0;
3837}
3838
6f3c0e69
AG		 3839int iscsi_target_tx_thread(void *arg)
3840{
e48354ce 3841 int ret = 0;
49b028d3 3842 struct iscsi_conn *conn = arg;
e48354ce
NB		 3843 /*
3844 * Allow ourselves to be interrupted by SIGINT so that a
3845 * connection recovery / failure event can be triggered externally.
3846 */
3847 allow_signal(SIGINT);
3848
e48354ce
NB		 3849 while (!kthread_should_stop()) {
3850 /*
3851 * Ensure that both TX and RX per connection kthreads
3852 * are scheduled to run on the same CPU.
3853 */
3854 iscsit_thread_check_cpumask(conn, current, 1);
3855
d5627acb 3856 wait_event_interruptible(conn->queues_wq,
49b028d3 3857 !iscsit_conn_all_queues_empty(conn));
e48354ce 3858
49b028d3 3859 if (signal_pending(current))
e48354ce
NB		 3860 goto transport_err;
3861
fd3a9025 3862get_immediate:
2ec5a8c1 3863 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3864 if (ret < 0)
3865 goto transport_err;
e48354ce 3866
2ec5a8c1 3867 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3868 if (ret == 1)
3869 goto get_immediate;
49b028d3
NB		 3870 else if (ret == -ECONNRESET)
3871 goto out;
6f3c0e69
AG		 3872 else if (ret < 0)
3873 goto transport_err;
e48354ce
NB		 3874 }
3875
3876transport_err:
621468a3
NB		 3877 /*
3878 * Avoid the normal connection failure code-path if this connection
3879 * is still within LOGIN mode, and iscsi_np process context is
3880 * responsible for cleaning up the early connection failure.
3881 */
3882 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3883 iscsit_take_action_for_connection_exit(conn);
e48354ce
NB		 3884out:
3885 return 0;
3886}
3887
3e1c81a9
NB		 3888static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3889{
3890 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3891 struct iscsi_cmd *cmd;
3892 int ret = 0;
3893
3894 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3895 case ISCSI_OP_SCSI_CMD:
3896 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3897 if (!cmd)
1aa58ccd 3898 goto reject;
3e1c81a9
NB		 3899
3900 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3901 break;
3902 case ISCSI_OP_SCSI_DATA_OUT:
3903 ret = iscsit_handle_data_out(conn, buf);
3904 break;
3905 case ISCSI_OP_NOOP_OUT:
3906 cmd = NULL;
3907 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3908 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3909 if (!cmd)
1aa58ccd 3910 goto reject;
3e1c81a9
NB		 3911 }
3912 ret = iscsit_handle_nop_out(conn, cmd, buf);
3913 break;
3914 case ISCSI_OP_SCSI_TMFUNC:
3915 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3916 if (!cmd)
1aa58ccd 3917 goto reject;
3e1c81a9
NB		 3918
3919 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3920 break;
3921 case ISCSI_OP_TEXT:
3922 ret = iscsit_handle_text_cmd(conn, buf);
3923 break;
3924 case ISCSI_OP_LOGOUT:
3925 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3926 if (!cmd)
1aa58ccd 3927 goto reject;
3e1c81a9
NB		 3928
3929 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3930 if (ret > 0)
3931 wait_for_completion_timeout(&conn->conn_logout_comp,
3932 SECONDS_FOR_LOGOUT_COMP * HZ);
3933 break;
3934 case ISCSI_OP_SNACK:
3935 ret = iscsit_handle_snack(conn, buf);
3936 break;
3937 default:
3938 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3939 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3940 pr_err("Cannot recover from unknown"
3941 " opcode while ERL=0, closing iSCSI connection.\n");
3942 return -1;
3943 }
3944 if (!conn->conn_ops->OFMarker) {
3945 pr_err("Unable to recover from unknown"
3946 " opcode while OFMarker=No, closing iSCSI"
3947 " connection.\n");
3948 return -1;
3949 }
3950 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3951 pr_err("Unable to recover from unknown"
3952 " opcode, closing iSCSI connection.\n");
3953 return -1;
3954 }
3955 break;
3956 }
3957
3958 return ret;
1aa58ccd
NB		 3959reject:
3960 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 3961}
3962
481c3420
NB		 3963static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3964{
3965 bool ret;
3966
3967 spin_lock_bh(&conn->state_lock);
3968 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3969 spin_unlock_bh(&conn->state_lock);
3970
3971 return ret;
3972}
3973
e48354ce
NB		 3974int iscsi_target_rx_thread(void *arg)
3975{
621468a3 3976 int ret, rc;
e48354ce
NB		 3977 u8 buffer[ISCSI_HDR_LEN], opcode;
3978 u32 checksum = 0, digest = 0;
49b028d3 3979 struct iscsi_conn *conn = arg;
e48354ce
NB		 3980 struct kvec iov;
3981 /*
3982 * Allow ourselves to be interrupted by SIGINT so that a
3983 * connection recovery / failure event can be triggered externally.
3984 */
3985 allow_signal(SIGINT);
621468a3
NB		 3986 /*
3987 * Wait for iscsi_post_login_handler() to complete before allowing
3988 * incoming iscsi/tcp socket I/O, and/or failing the connection.
3989 */
3990 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
481c3420 3991 if (rc < 0 || iscsi_target_check_conn_state(conn))
621468a3 3992 return 0;
e48354ce 3993
3e1c81a9
NB		 3994 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
3995 struct completion comp;
3e1c81a9
NB		 3996
3997 init_completion(&comp);
3998 rc = wait_for_completion_interruptible(&comp);
3999 if (rc < 0)
4000 goto transport_err;
4001
49b028d3 4002 goto transport_err;
3e1c81a9
NB		 4003 }
4004
e48354ce
NB		 4005 while (!kthread_should_stop()) {
4006 /*
4007 * Ensure that both TX and RX per connection kthreads
4008 * are scheduled to run on the same CPU.
4009 */
4010 iscsit_thread_check_cpumask(conn, current, 0);
4011
4012 memset(buffer, 0, ISCSI_HDR_LEN);
4013 memset(&iov, 0, sizeof(struct kvec));
4014
4015 iov.iov_base = buffer;
4016 iov.iov_len = ISCSI_HDR_LEN;
4017
4018 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4019 if (ret != ISCSI_HDR_LEN) {
4020 iscsit_rx_thread_wait_for_tcp(conn);
4021 goto transport_err;
4022 }
4023
4024 /*
4025 * Set conn->bad_hdr for use with REJECT PDUs.
4026 */
4027 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4028
4029 if (conn->conn_ops->HeaderDigest) {
4030 iov.iov_base = &digest;
4031 iov.iov_len = ISCSI_CRC_LEN;
4032
4033 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4034 if (ret != ISCSI_CRC_LEN) {
4035 iscsit_rx_thread_wait_for_tcp(conn);
4036 goto transport_err;
4037 }
4038
4039 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4040 buffer, ISCSI_HDR_LEN,
4041 0, NULL, (u8 *)&checksum);
4042
4043 if (digest != checksum) {
4044 pr_err("HeaderDigest CRC32C failed,"
4045 " received 0x%08x, computed 0x%08x\n",
4046 digest, checksum);
4047 /*
4048 * Set the PDU to 0xff so it will intentionally
4049 * hit default in the switch below.
4050 */
4051 memset(buffer, 0xff, ISCSI_HDR_LEN);
4052 spin_lock_bh(&conn->sess->session_stats_lock);
4053 conn->sess->conn_digest_errors++;
4054 spin_unlock_bh(&conn->sess->session_stats_lock);
4055 } else {
4056 pr_debug("Got HeaderDigest CRC32C"
4057 " 0x%08x\n", checksum);
4058 }
4059 }
4060
4061 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4062 goto transport_err;
4063
4064 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4065
4066 if (conn->sess->sess_ops->SessionType &&
4067 ((!(opcode & ISCSI_OP_TEXT)) ||
4068 (!(opcode & ISCSI_OP_LOGOUT)))) {
4069 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4070 " while in Discovery Session, rejecting.\n", opcode);
1aa58ccd
NB		 4071 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4072 buffer);
e48354ce
NB		 4073 goto transport_err;
4074 }
4075
3e1c81a9
NB		 4076 ret = iscsi_target_rx_opcode(conn, buffer);
4077 if (ret < 0)
4078 goto transport_err;
e48354ce
NB		 4079 }
4080
4081transport_err:
4082 if (!signal_pending(current))
4083 atomic_set(&conn->transport_failed, 1);
4084 iscsit_take_action_for_connection_exit(conn);
e48354ce
NB		 4085 return 0;
4086}
4087
4088static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4089{
4090 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4091 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4092 /*
4093 * We expect this function to only ever be called from either RX or TX
4094 * thread context via iscsit_close_connection() once the other context
4095 * has been reset -> returned sleeping pre-handler state.
4096 */
4097 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4098 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4099
af737f67 4100 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4101 spin_unlock_bh(&conn->cmd_lock);
4102
4103 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4104
aafc9d15 4105 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4106
4107 spin_lock_bh(&conn->cmd_lock);
4108 }
4109 spin_unlock_bh(&conn->cmd_lock);
4110}
4111
4112static void iscsit_stop_timers_for_cmds(
4113 struct iscsi_conn *conn)
4114{
4115 struct iscsi_cmd *cmd;
4116
4117 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4118 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4119 if (cmd->data_direction == DMA_TO_DEVICE)
4120 iscsit_stop_dataout_timer(cmd);
4121 }
4122 spin_unlock_bh(&conn->cmd_lock);
4123}
4124
4125int iscsit_close_connection(
4126 struct iscsi_conn *conn)
4127{
4128 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4129 struct iscsi_session *sess = conn->sess;
4130
4131 pr_debug("Closing iSCSI connection CID %hu on SID:"
4132 " %u\n", conn->cid, sess->sid);
4133 /*
20781616
NB		 4134 * Always up conn_logout_comp for the traditional TCP case just in case
4135 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4136 * response never got sent because the connection failed.
4137 *
4138 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4139 * to signal logout response TX interrupt completion. Go ahead and skip
4140 * this for iser since isert_rx_opcode() does not wait on logout failure,
4141 * and to avoid iscsi_conn pointer dereference in iser-target code.
e48354ce 4142 */
20781616
NB		 4143 if (conn->conn_transport->transport_type == ISCSI_TCP)
4144 complete(&conn->conn_logout_comp);
e48354ce 4145
49b028d3
NB		 4146 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4147 if (conn->tx_thread &&
4148 cmpxchg(&conn->tx_thread_active, true, false)) {
4149 send_sig(SIGINT, conn->tx_thread, 1);
4150 kthread_stop(conn->tx_thread);
4151 }
4152 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4153 if (conn->rx_thread &&
4154 cmpxchg(&conn->rx_thread_active, true, false)) {
4155 send_sig(SIGINT, conn->rx_thread, 1);
4156 kthread_stop(conn->rx_thread);
4157 }
4158 }
4159
4160 spin_lock(&iscsit_global->ts_bitmap_lock);
4161 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4162 get_order(1));
4163 spin_unlock(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 4164
4165 iscsit_stop_timers_for_cmds(conn);
4166 iscsit_stop_nopin_response_timer(conn);
4167 iscsit_stop_nopin_timer(conn);
d8bd97a0
NB		 4168
4169 if (conn->conn_transport->iscsit_wait_conn)
4170 conn->conn_transport->iscsit_wait_conn(conn);
4171
e48354ce
NB		 4172 /*
4173 * During Connection recovery drop unacknowledged out of order
4174 * commands for this connection, and prepare the other commands
4175 * for realligence.
4176 *
4177 * During normal operation clear the out of order commands (but
4178 * do not free the struct iscsi_ooo_cmdsn's) and release all
4179 * struct iscsi_cmds.
4180 */
4181 if (atomic_read(&conn->connection_recovery)) {
4182 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4183 iscsit_prepare_cmds_for_realligance(conn);
4184 } else {
4185 iscsit_clear_ooo_cmdsns_for_conn(conn);
4186 iscsit_release_commands_from_conn(conn);
4187 }
dda585bf 4188 iscsit_free_queue_reqs_for_conn(conn);
e48354ce
NB		 4189
4190 /*
4191 * Handle decrementing session or connection usage count if
4192 * a logout response was not able to be sent because the
4193 * connection failed. Fall back to Session Recovery here.
4194 */
4195 if (atomic_read(&conn->conn_logout_remove)) {
4196 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4197 iscsit_dec_conn_usage_count(conn);
4198 iscsit_dec_session_usage_count(sess);
4199 }
4200 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4201 iscsit_dec_conn_usage_count(conn);
4202
4203 atomic_set(&conn->conn_logout_remove, 0);
4204 atomic_set(&sess->session_reinstatement, 0);
4205 atomic_set(&sess->session_fall_back_to_erl0, 1);
4206 }
4207
4208 spin_lock_bh(&sess->conn_lock);
4209 list_del(&conn->conn_list);
4210
4211 /*
4212 * Attempt to let the Initiator know this connection failed by
4213 * sending an Connection Dropped Async Message on another
4214 * active connection.
4215 */
4216 if (atomic_read(&conn->connection_recovery))
4217 iscsit_build_conn_drop_async_message(conn);
4218
4219 spin_unlock_bh(&sess->conn_lock);
4220
4221 /*
4222 * If connection reinstatement is being performed on this connection,
4223 * up the connection reinstatement semaphore that is being blocked on
4224 * in iscsit_cause_connection_reinstatement().
4225 */
4226 spin_lock_bh(&conn->state_lock);
4227 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4228 spin_unlock_bh(&conn->state_lock);
4229 complete(&conn->conn_wait_comp);
4230 wait_for_completion(&conn->conn_post_wait_comp);
4231 spin_lock_bh(&conn->state_lock);
4232 }
4233
4234 /*
4235 * If connection reinstatement is being performed on this connection
4236 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4237 * connection wait rcfr semaphore that is being blocked on
4238 * an iscsit_connection_reinstatement_rcfr().
4239 */
4240 if (atomic_read(&conn->connection_wait_rcfr)) {
4241 spin_unlock_bh(&conn->state_lock);
4242 complete(&conn->conn_wait_rcfr_comp);
4243 wait_for_completion(&conn->conn_post_wait_comp);
4244 spin_lock_bh(&conn->state_lock);
4245 }
4246 atomic_set(&conn->connection_reinstatement, 1);
4247 spin_unlock_bh(&conn->state_lock);
4248
4249 /*
4250 * If any other processes are accessing this connection pointer we
4251 * must wait until they have completed.
4252 */
4253 iscsit_check_conn_usage_count(conn);
4254
4255 if (conn->conn_rx_hash.tfm)
4256 crypto_free_hash(conn->conn_rx_hash.tfm);
4257 if (conn->conn_tx_hash.tfm)
4258 crypto_free_hash(conn->conn_tx_hash.tfm);
4259
4260 if (conn->conn_cpumask)
4261 free_cpumask_var(conn->conn_cpumask);
4262
4263 kfree(conn->conn_ops);
4264 conn->conn_ops = NULL;
4265
bf6932f4 4266 if (conn->sock)
e48354ce 4267 sock_release(conn->sock);
baa4d64b
NB		 4268
4269 if (conn->conn_transport->iscsit_free_conn)
4270 conn->conn_transport->iscsit_free_conn(conn);
4271
4272 iscsit_put_transport(conn->conn_transport);
4273
e48354ce
NB		 4274 conn->thread_set = NULL;
4275
4276 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4277 conn->conn_state = TARG_CONN_STATE_FREE;
4278 kfree(conn);
4279
4280 spin_lock_bh(&sess->conn_lock);
4281 atomic_dec(&sess->nconn);
4282 pr_debug("Decremented iSCSI connection count to %hu from node:"
4283 " %s\n", atomic_read(&sess->nconn),
4284 sess->sess_ops->InitiatorName);
4285 /*
4286 * Make sure that if one connection fails in an non ERL=2 iSCSI
4287 * Session that they all fail.
4288 */
4289 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4290 !atomic_read(&sess->session_logout))
4291 atomic_set(&sess->session_fall_back_to_erl0, 1);
4292
4293 /*
4294 * If this was not the last connection in the session, and we are
4295 * performing session reinstatement or falling back to ERL=0, call
4296 * iscsit_stop_session() without sleeping to shutdown the other
4297 * active connections.
4298 */
4299 if (atomic_read(&sess->nconn)) {
4300 if (!atomic_read(&sess->session_reinstatement) &&
4301 !atomic_read(&sess->session_fall_back_to_erl0)) {
4302 spin_unlock_bh(&sess->conn_lock);
4303 return 0;
4304 }
4305 if (!atomic_read(&sess->session_stop_active)) {
4306 atomic_set(&sess->session_stop_active, 1);
4307 spin_unlock_bh(&sess->conn_lock);
4308 iscsit_stop_session(sess, 0, 0);
4309 return 0;
4310 }
4311 spin_unlock_bh(&sess->conn_lock);
4312 return 0;
4313 }
4314
4315 /*
4316 * If this was the last connection in the session and one of the
4317 * following is occurring:
4318 *
4319 * Session Reinstatement is not being performed, and are falling back
4320 * to ERL=0 call iscsit_close_session().
4321 *
4322 * Session Logout was requested. iscsit_close_session() will be called
4323 * elsewhere.
4324 *
4325 * Session Continuation is not being performed, start the Time2Retain
4326 * handler and check if sleep_on_sess_wait_sem is active.
4327 */
4328 if (!atomic_read(&sess->session_reinstatement) &&
4329 atomic_read(&sess->session_fall_back_to_erl0)) {
4330 spin_unlock_bh(&sess->conn_lock);
99367f01 4331 target_put_session(sess->se_sess);
e48354ce
NB		 4332
4333 return 0;
4334 } else if (atomic_read(&sess->session_logout)) {
4335 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4336 sess->session_state = TARG_SESS_STATE_FREE;
4337 spin_unlock_bh(&sess->conn_lock);
4338
4339 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4340 complete(&sess->session_wait_comp);
4341
4342 return 0;
4343 } else {
4344 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4345 sess->session_state = TARG_SESS_STATE_FAILED;
4346
4347 if (!atomic_read(&sess->session_continuation)) {
4348 spin_unlock_bh(&sess->conn_lock);
4349 iscsit_start_time2retain_handler(sess);
4350 } else
4351 spin_unlock_bh(&sess->conn_lock);
4352
4353 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4354 complete(&sess->session_wait_comp);
4355
4356 return 0;
4357 }
4358 spin_unlock_bh(&sess->conn_lock);
4359
4360 return 0;
4361}
4362
4363int iscsit_close_session(struct iscsi_session *sess)
4364{
4365 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4366 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4367
4368 if (atomic_read(&sess->nconn)) {
4369 pr_err("%d connection(s) still exist for iSCSI session"
4370 " to %s\n", atomic_read(&sess->nconn),
4371 sess->sess_ops->InitiatorName);
4372 BUG();
4373 }
4374
4375 spin_lock_bh(&se_tpg->session_lock);
4376 atomic_set(&sess->session_logout, 1);
4377 atomic_set(&sess->session_reinstatement, 1);
4378 iscsit_stop_time2retain_timer(sess);
4379 spin_unlock_bh(&se_tpg->session_lock);
4380
4381 /*
4382 * transport_deregister_session_configfs() will clear the
4383 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4384 * can be setting it again with __transport_register_session() in
4385 * iscsi_post_login_handler() again after the iscsit_stop_session()
4386 * completes in iscsi_np context.
4387 */
4388 transport_deregister_session_configfs(sess->se_sess);
4389
4390 /*
4391 * If any other processes are accessing this session pointer we must
4392 * wait until they have completed. If we are in an interrupt (the
4393 * time2retain handler) and contain and active session usage count we
4394 * restart the timer and exit.
4395 */
4396 if (!in_interrupt()) {
4397 if (iscsit_check_session_usage_count(sess) == 1)
4398 iscsit_stop_session(sess, 1, 1);
4399 } else {
4400 if (iscsit_check_session_usage_count(sess) == 2) {
4401 atomic_set(&sess->session_logout, 0);
4402 iscsit_start_time2retain_handler(sess);
4403 return 0;
4404 }
4405 }
4406
4407 transport_deregister_session(sess->se_sess);
4408
4409 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4410 iscsit_free_connection_recovery_entires(sess);
4411
4412 iscsit_free_all_ooo_cmdsns(sess);
4413
4414 spin_lock_bh(&se_tpg->session_lock);
4415 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4416 sess->session_state = TARG_SESS_STATE_FREE;
4417 pr_debug("Released iSCSI session from node: %s\n",
4418 sess->sess_ops->InitiatorName);
4419 tpg->nsessions--;
4420 if (tpg->tpg_tiqn)
4421 tpg->tpg_tiqn->tiqn_nsessions--;
4422
4423 pr_debug("Decremented number of active iSCSI Sessions on"
4424 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4425
4426 spin_lock(&sess_idr_lock);
4427 idr_remove(&sess_idr, sess->session_index);
4428 spin_unlock(&sess_idr_lock);
4429
4430 kfree(sess->sess_ops);
4431 sess->sess_ops = NULL;
4432 spin_unlock_bh(&se_tpg->session_lock);
4433
4434 kfree(sess);
4435 return 0;
4436}
4437
4438static void iscsit_logout_post_handler_closesession(
4439 struct iscsi_conn *conn)
4440{
4441 struct iscsi_session *sess = conn->sess;
92eba7dd
NB		 4442 int sleep = 1;
4443 /*
4444 * Traditional iscsi/tcp will invoke this logic from TX thread
4445 * context during session logout, so clear tx_thread_active and
4446 * sleep if iscsit_close_connection() has not already occured.
4447 *
4448 * Since iser-target invokes this logic from it's own workqueue,
4449 * always sleep waiting for RX/TX thread shutdown to complete
4450 * within iscsit_close_connection().
4451 */
4452 if (conn->conn_transport->transport_type == ISCSI_TCP)
4453 sleep = cmpxchg(&conn->tx_thread_active, true, false);
e48354ce
NB		 4454
4455 atomic_set(&conn->conn_logout_remove, 0);
4456 complete(&conn->conn_logout_comp);
4457
4458 iscsit_dec_conn_usage_count(conn);
49b028d3 4459 iscsit_stop_session(sess, sleep, sleep);
e48354ce 4460 iscsit_dec_session_usage_count(sess);
99367f01 4461 target_put_session(sess->se_sess);
e48354ce
NB		 4462}
4463
4464static void iscsit_logout_post_handler_samecid(
4465 struct iscsi_conn *conn)
4466{
92eba7dd
NB		 4467 int sleep = 1;
4468
4469 if (conn->conn_transport->transport_type == ISCSI_TCP)
4470 sleep = cmpxchg(&conn->tx_thread_active, true, false);
e48354ce
NB		 4471
4472 atomic_set(&conn->conn_logout_remove, 0);
4473 complete(&conn->conn_logout_comp);
4474
49b028d3 4475 iscsit_cause_connection_reinstatement(conn, sleep);
e48354ce
NB		 4476 iscsit_dec_conn_usage_count(conn);
4477}
4478
4479static void iscsit_logout_post_handler_diffcid(
4480 struct iscsi_conn *conn,
4481 u16 cid)
4482{
4483 struct iscsi_conn *l_conn;
4484 struct iscsi_session *sess = conn->sess;
b04cb59b 4485 bool conn_found = false;
e48354ce
NB		 4486
4487 if (!sess)
4488 return;
4489
4490 spin_lock_bh(&sess->conn_lock);
4491 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4492 if (l_conn->cid == cid) {
4493 iscsit_inc_conn_usage_count(l_conn);
b04cb59b 4494 conn_found = true;
e48354ce
NB		 4495 break;
4496 }
4497 }
4498 spin_unlock_bh(&sess->conn_lock);
4499
b04cb59b 4500 if (!conn_found)
e48354ce
NB		 4501 return;
4502
4503 if (l_conn->sock)
4504 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4505
4506 spin_lock_bh(&l_conn->state_lock);
4507 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4508 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4509 spin_unlock_bh(&l_conn->state_lock);
4510
4511 iscsit_cause_connection_reinstatement(l_conn, 1);
4512 iscsit_dec_conn_usage_count(l_conn);
4513}
4514
4515/*
4516 * Return of 0 causes the TX thread to restart.
4517 */
2ec5a8c1 4518int iscsit_logout_post_handler(
e48354ce
NB		 4519 struct iscsi_cmd *cmd,
4520 struct iscsi_conn *conn)
4521{
4522 int ret = 0;
4523
4524 switch (cmd->logout_reason) {
4525 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4526 switch (cmd->logout_response) {
4527 case ISCSI_LOGOUT_SUCCESS:
4528 case ISCSI_LOGOUT_CLEANUP_FAILED:
4529 default:
4530 iscsit_logout_post_handler_closesession(conn);
4531 break;
4532 }
4533 ret = 0;
4534 break;
4535 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4536 if (conn->cid == cmd->logout_cid) {
4537 switch (cmd->logout_response) {
4538 case ISCSI_LOGOUT_SUCCESS:
4539 case ISCSI_LOGOUT_CLEANUP_FAILED:
4540 default:
4541 iscsit_logout_post_handler_samecid(conn);
4542 break;
4543 }
4544 ret = 0;
4545 } else {
4546 switch (cmd->logout_response) {
4547 case ISCSI_LOGOUT_SUCCESS:
4548 iscsit_logout_post_handler_diffcid(conn,
4549 cmd->logout_cid);
4550 break;
4551 case ISCSI_LOGOUT_CID_NOT_FOUND:
4552 case ISCSI_LOGOUT_CLEANUP_FAILED:
4553 default:
4554 break;
4555 }
4556 ret = 1;
4557 }
4558 break;
4559 case ISCSI_LOGOUT_REASON_RECOVERY:
4560 switch (cmd->logout_response) {
4561 case ISCSI_LOGOUT_SUCCESS:
4562 case ISCSI_LOGOUT_CID_NOT_FOUND:
4563 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4564 case ISCSI_LOGOUT_CLEANUP_FAILED:
4565 default:
4566 break;
4567 }
4568 ret = 1;
4569 break;
4570 default:
4571 break;
4572
4573 }
4574 return ret;
4575}
2ec5a8c1 4576EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4577
4578void iscsit_fail_session(struct iscsi_session *sess)
4579{
4580 struct iscsi_conn *conn;
4581
4582 spin_lock_bh(&sess->conn_lock);
4583 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4584 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4585 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4586 }
4587 spin_unlock_bh(&sess->conn_lock);
4588
4589 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4590 sess->session_state = TARG_SESS_STATE_FAILED;
4591}
4592
4593int iscsit_free_session(struct iscsi_session *sess)
4594{
4595 u16 conn_count = atomic_read(&sess->nconn);
4596 struct iscsi_conn *conn, *conn_tmp = NULL;
4597 int is_last;
4598
4599 spin_lock_bh(&sess->conn_lock);
4600 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4601
4602 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4603 conn_list) {
4604 if (conn_count == 0)
4605 break;
4606
4607 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4608 is_last = 1;
4609 } else {
4610 iscsit_inc_conn_usage_count(conn_tmp);
4611 is_last = 0;
4612 }
4613 iscsit_inc_conn_usage_count(conn);
4614
4615 spin_unlock_bh(&sess->conn_lock);
4616 iscsit_cause_connection_reinstatement(conn, 1);
4617 spin_lock_bh(&sess->conn_lock);
4618
4619 iscsit_dec_conn_usage_count(conn);
4620 if (is_last == 0)
4621 iscsit_dec_conn_usage_count(conn_tmp);
4622
4623 conn_count--;
4624 }
4625
4626 if (atomic_read(&sess->nconn)) {
4627 spin_unlock_bh(&sess->conn_lock);
4628 wait_for_completion(&sess->session_wait_comp);
4629 } else
4630 spin_unlock_bh(&sess->conn_lock);
4631
99367f01 4632 target_put_session(sess->se_sess);
e48354ce
NB		 4633 return 0;
4634}
4635
4636void iscsit_stop_session(
4637 struct iscsi_session *sess,
4638 int session_sleep,
4639 int connection_sleep)
4640{
4641 u16 conn_count = atomic_read(&sess->nconn);
4642 struct iscsi_conn *conn, *conn_tmp = NULL;
4643 int is_last;
4644
4645 spin_lock_bh(&sess->conn_lock);
4646 if (session_sleep)
4647 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4648
4649 if (connection_sleep) {
4650 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4651 conn_list) {
4652 if (conn_count == 0)
4653 break;
4654
4655 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4656 is_last = 1;
4657 } else {
4658 iscsit_inc_conn_usage_count(conn_tmp);
4659 is_last = 0;
4660 }
4661 iscsit_inc_conn_usage_count(conn);
4662
4663 spin_unlock_bh(&sess->conn_lock);
4664 iscsit_cause_connection_reinstatement(conn, 1);
4665 spin_lock_bh(&sess->conn_lock);
4666
4667 iscsit_dec_conn_usage_count(conn);
4668 if (is_last == 0)
4669 iscsit_dec_conn_usage_count(conn_tmp);
4670 conn_count--;
4671 }
4672 } else {
4673 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4674 iscsit_cause_connection_reinstatement(conn, 0);
4675 }
4676
4677 if (session_sleep && atomic_read(&sess->nconn)) {
4678 spin_unlock_bh(&sess->conn_lock);
4679 wait_for_completion(&sess->session_wait_comp);
4680 } else
4681 spin_unlock_bh(&sess->conn_lock);
4682}
4683
4684int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4685{
4686 struct iscsi_session *sess;
4687 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4688 struct se_session *se_sess, *se_sess_tmp;
8345c741 4689 LIST_HEAD(free_list);
e48354ce
NB		 4690 int session_count = 0;
4691
4692 spin_lock_bh(&se_tpg->session_lock);
4693 if (tpg->nsessions && !force) {
4694 spin_unlock_bh(&se_tpg->session_lock);
4695 return -1;
4696 }
4697
4698 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4699 sess_list) {
4700 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4701
4702 spin_lock(&sess->conn_lock);
4703 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4704 atomic_read(&sess->session_logout) ||
4705 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4706 spin_unlock(&sess->conn_lock);
4707 continue;
4708 }
4709 atomic_set(&sess->session_reinstatement, 1);
4710 spin_unlock(&sess->conn_lock);
e48354ce 4711
8345c741
NB		 4712 list_move_tail(&se_sess->sess_list, &free_list);
4713 }
4714 spin_unlock_bh(&se_tpg->session_lock);
e48354ce 4715
8345c741
NB		 4716 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4717 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4718
4719 iscsit_free_session(sess);
e48354ce
NB		 4720 session_count++;
4721 }
e48354ce
NB		 4722
4723 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4724 " Group: %hu\n", session_count, tpg->tpgt);
4725 return 0;
4726}
4727
4728MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4729MODULE_VERSION("4.1.x");
4730MODULE_AUTHOR("nab@Linux-iSCSI.org");
4731MODULE_LICENSE("GPL");
4732
4733module_init(iscsi_target_init_module);
4734module_exit(iscsi_target_cleanup_module);
kernel source for telekom puls (alcatel/mediatek)